保护动物初二英语作文4篇 作文怎么写【通用20篇】

We want to hold a green Olympic Games ,so everyone should do something

useful to protect the environment ,whether it is big or small.

We should do something to stop people from doing bad things to the

environment .We should put rubbish into dustbins instead of throwing it about.

Everyone must care for flowers ,grass and tress in public .We shound collect

things like paper ,plastic bags our neighborhood as well ,it’s necessary to

plant more trees every year .

It is everyone’s duty to make our neighborhood much better with our hands

minds .Let’s make a contribution to protecting the environment and the Plympic

Games successfully.

Good morning!everyone,I am XX,fromXXX,i am so happy to have a change to tell all of you my favorite animal—— panda.She comes from China,why did I love her?Because she is very cute,but she was very shy.Her body stout like bears,but the first round tail short,black and white fur and white head and body clear.She staple food of bamboo,but also addicted to love drinking water,most of the giant pandas homes are located near the water in streams,the nearest will be able to drink clear spring.

大家好!我是来自X班的XX,非常高兴有机会在这里向大家介绍我喜欢的动物——大熊猫.她来自中国,为什么我爱她?因为她很可爱,但她很害羞.她的身体粗壮如熊,但在第一轮尾巴短,黑色和白色皮毛和白色的头和身体清晰.她主食竹,而且还染上爱饮用水,大熊猫的家园大多在附近的溪流水位置,最近将能够喝清泉.

稍微弯曲的耳朵，中分的发型，又大又亮的深棕色眼睛，凑成了我家霸气侧漏的小猫“狮子”。

小小的身体里总是蕴含着大力量，这句话形容咱家的“狮子”再合适不过了。别看它身形小，抢夺食物的战斗力，绝不亚于万首之王——老虎。所以，我给它喂食好，便将食物放在饭桌上，以免被他吃光。

1秒，2秒……它一开始心里还有所抵抗，不过在第3秒，它那枚吃货的心开始四处乱蹦。

它先是掂量似的蹦哒了几下，见够不着，就先往后退了3步，像跳高运动员似的向前冲刺，在临近桌脚的地方奋力一跳，可惜了，还是差一点儿，可它并没有灰心，不知从哪儿找来了糖果盒子。一步一步的拖向桌角旁，它跳上去，摸到了椅子的坐垫，此刻，它多么希望自己能长高点啊!这样就可以跳上椅子，享用美食了，真是太悲哀了。它气鼓鼓的跳下盒子，用幽怨的眼神环视着房间各个角落，跑去搬来了我早已丢弃的眼镜盒。它开心的围着眼镜盒转了几圈飞快地推向了糖果盒并十分费力的将眼镜盒推上去。

它兴奋地站在眼镜盒上，扑向椅子，站在上面的它威风凛凛，时机已到。只见它十分灵巧地跳向猫粮，两颊仿佛泛着红晕，棕色的眼睛里闪出奇异的光芒，体态极其优美像极了专业的芭蕾舞演员，嘴巴微微张起，两只爪臂张大，爪尖上锋利的指甲早已展露出来，四处扭动，身上的每一个细胞都告诉了我们它抢夺的决心，只可惜，天有不测风云，它抓到的不仅仅是猫粮，还有猫粮的包装袋，所以，由于包装袋承受不了如此沉重之物，“嘭”，袋子掉下来了，“喵——喵——喵”我随着猫叫声，走出来，“狮子”只是摔在柔软的椅垫上，地上则一片狼藉。

我十分无奈：你啊你，真是一只活生生的大狮子!

Water pollution on the impact of industrial and agricultural production of industrial and agricultural production not only need to have enough water, but also have some requirements for water quality. Otherwise, the industrial and agricultural industry will cause great losses, especially in the industrial and agricultural production process using contaminated water, the human has a great harm. First, the destruction of industrial equipment, a serious impact on product quality. Second, the chemical composition of the soil changes, fertility decreased, leading to crop reduction and serious pollution. Third, the city to increase domestic water and industrial water treatment costs.

Clean air is the necessary material basis for people to survive, an adult to breathe an average of 15 cubic meters of air a day, if people breathe heavily polluted air, no doubt harmful to health. Therefore, the study of the impact of air pollution, awareness of the value of clean air is a very complex frontier research project. And children in the growth and development stage, is the most sensitive to the outside world air pollution, the study of air pollution on children more likely to obtain valuable results. Based on this, the Chinese Academy of Engineering, China Environmental Monitoring Station Chief Engineer Wei Fusheng for the Chinese chief scientist of the Sino-US scientific and technological cooperation projects one by one air pollution on the impact of human respiratory health research, in Guangzhou, Wuhan, Lanzhou, Chongqing and other cities and suburbs The results showed that 8196 questionnaires were used to investigate the pulmonary function of children in the air, including environmental monitoring data, and about 3 million data were obtained. After statistical analysis, Air pollution has a quantitative understanding of the effects of human respiratory health (especially children). The results confirmed that the impact on human health to the fine particles of air pollution is most serious (China has 2/3 of the city exceeded), followed by sulfur dioxide pollution (1/3 of our city exceeded), the impact of nitrogen oxide pollution relative Weak. It can be said that fine particles (respirable particulate matter) is the first killer of human health. According to experts, particulate matter attached to the toxic heavy metals, acidic oxides compared with the soil enrichment hundreds of times, thousands of times, or even tens of thousands of times, and can float in the air up to several days, harmful substances with the inhalation Particles into the human lungs, and may through the alveolar into the blood, directly endanger human health.

Recently, the eight-year research results in Beijing adopted by the State Environmental Protection Administration presided over the expert appraisal. Experts believe that this research results for our understanding of the importance of clean air, improve the public and the leadership of environmental awareness is of great significance. The data of the research results provide a scientific basis for the national air environment legislation, the development and revision of air quality standards, emission standards and air pollution control policies.

Protecting birds is part of our jobs of protecting our own living environment. Imagine you live in a place with green trees and colourful flowers. The little birds are flying around and singing happily. Its such a wonderful place to live. On the contrary, if we damaged the nature, chopped all the trees and kill all birds, we will live in a desert where has no living creatures. What a boring live would be! Therefore, we should protect birds as we protect our childern and ourselves future.

The Longhu villa in my hometown Pengshui County, where the fog is floating, (.) is a magical and beautiful place.

The flag up to an altitude of about 1000 meters high, halfway up the mountain air is very sweet, very refreshing. The mountain long rows of trees under the tree is a wild profusion of vegetation, and insects and other small animal snake, so you walk can hear small animal sounds.

The most interesting, is that the top of the thick fog, one or two months a year, on the top of the mountain will have a thick layers of fog, you can put the fog blowing a "hole" in one breath, but it closed in neither fast nor slow, steep peak, have a piece of egg shaped stone. Its a good place to watch the fog, but prone to hallucinations sitting on the stone, you will feel as if you are sitting in the clouds is Sun Wukong, somersault cloud, all of a sudden to jump down! And its easy to sit on the stone and jump down! You know, this stone is surrounded by a cliff! So, its better not to sit on the stone, because its a safe one!

动物是我们人类的好朋友，有很多对我们有益的动物呢!你们知道我认识的动物是什么吗?告诉你们吧，它们是：蜘蛛、水枪鱼、壁虎，这些动物都是吃虫子的。

蜘蛛是一个会结网的能手!它结了网就可以把害虫捉住了。其实，它的网是粘粘的，透明的，难以看见，等蚊子、苍蝇经过的时候，一不小心就会被蜘蛛网粘住，蜘蛛就会美餐一顿了!

不但蜘蛛会吃蚊子，也有别的动物爱吃蚊子，但它们捉害虫的地方是不同的。水枪鱼是在河里，一看到岸边的野草上的害虫，就游到离那东西很近的地方，然后，吸一点水朝害虫喷去，害虫打中了!落下来，落到了水枪鱼的嘴里。壁虎是在墙上找蚊子吃的，只要它看到墙上有一只虫子，就轻手轻脚地接近虫子，让虫子感觉不到，然后，一下扑过去，吃掉虫子就慢慢地回家了。

我们要保护有益的动物，让害虫变得更少，美化我们的环境。

My favourite animal 范文一

Dolphin is my favourite animal.

It is one of the most precious animals. Their bodies are very long, about one zhang（丈）. Dolphins live in the sea. They live on fish, shrimps and so on.

Dolphins are very friendly and peaceful. They never attack people. Instead, they have saved many people in danger in the past years. How helpful the dolphins are!

Dolphins are very clever. People often train them so that they can give a dolphin show which brings people a lot of happiness and joy.

Unluckily, the number of dolphins is getting smaller and smaller. Because of water pollution, there is less and less space for dolphins. Many people make money by hunting dolphins. If we don’t protect them, maybe we’ll lose our good friends one day. As a student, I hope more and more people should take actions to protect dolphins.

My favourite animal 范文二

My favourite animal is tortoise. Tortoise walk not fast. But I like the tortoise. Why? Because, tortoise is a cute animal. It have a short tail and a four short foot. It have a little head and a hard shell. They are forty-five little and cute tortoise in My home. They like to play in the water. When they afraid some thing. They wall run fast. They like to eat the fish. I often buy some small fish to them to eat. They can catch the fish fast. First, they fake(假) sleep. When the fish swim near they mouth. They catch the fish fast and bit the fish head. So, the fish die. They can eat the fish. In winter. They like to sleep in the sand. When they sleep, they don’t eat any food.Because they wall hibernation. But, when they are thirsty. They come out of the sand. So, we must give water to them to drink.

I love the tortoise. I hate the eagle. Because, the eagle often eat the tortoise with it sharp mouth.My favourite animal is tortoise.

My Favourite Animal 范文三

My favourite animal is a dog.I had a dog when I was ten years old.Its name is Lily.Its a brown and white dog.It does everything with me.Everyday I give it some water to drink and some food to eat.At the weekend,Ill make it take a bath.At that time,the dog is very gentle.And I like it very much.This is my favorite animal----a beautiful,gentle and lovely dog.

Children, you grabbed the small tadpoles right, you must know that tadpole grew up to become small frog, the frog can eat insects, so the frog is our humans good friends. We should protect it, not hurt it. But some hotels are also sold the frog meat? Once, dad and his friends took me to dinner. A waiter said: "you see, this is we store the launch of new specials, stir flogs ball". "Chicken is what ah?" I curiously ask, "chicken is the frog." The waiter said, with a smile. I was very angry, because they hurt our good friends-frog! Another thing, he makes a big inspiration. One day, when I finish school, saw a man at the school gate at little chicks must sell, and I will have mercy on them. Because the little chicks must first came to this world, away from the mother, away from the mother love and mother warm embrace, and this is what they faced starved to death, the risk of freezing to death. At that time I thought: we humans are so happy! When you see here, did you see to protect our human friends-animals!

小朋友，你们抓过小蝌蚪吧，你们一定知道蝌蚪长大要变成小青蛙，青蛙可以吃害虫，所以青蛙是我们人类的好朋友。我们应该保护它，而不是伤害它。 可是有些饭店还卖青蛙肉呢。有一次，爸爸和他的朋友带着我去吃饭。一位服务员过来说：“您看，这是我们店新推出的特色菜，爆炒田鸡球”。“田鸡是什么 呀?”我好奇地问，“田鸡是青蛙。”服务员笑着说道。我当时很气愤，因为他们伤害了我们的好朋友——青蛙!还有一件事，他对我有很大的启发。一天，我放学 的时候，看见一个人在学校门口卖小鸡仔，我好可怜它们。因为小鸡仔刚来到这个世界上，就远离了妈妈，远离了母爱和妈妈温暖的怀抱，这也使它们面临着饿死、 冻死的危险。当时我想到了：我们人类是多么幸福啊!当你看到这里时，你是不是明白了要保护我们人类的朋友——动物呀!

一转眼，我已成为一名小动物保护协会的会员了。

一个酷暑难当的夏日，我接到了一个紧急救援电话：您好!我在玫瑰街珊瑚小区23号楼下的花坛内发现一只受伤的流浪猫。这只猫的伤势十分严重，请立即到达现场!放下话筒，我和同事们就带上医疗箱，驱车前往。 我们到达目的地后，果然看见一只流浪猫奄奄一息地躺在地上，它的后腿上有一道很长的伤口，伤口里似乎还有一些杂物，伤口四周已经溃烂，流着脓。我和同事们赶紧用酒精为它消毒，再用纱布简单包扎了一下，然后将它带回小动物保护协会。

回到保护协会，我们立刻投入治疗工作中。 我小心翼翼地剔除掉猫咪腿上伤口中的杂物，进行深一层次的消毒。接着，我把溃烂的地方用手术刀轻轻挖去，随后上药，缝合伤口，最后用纱布缠在伤口上。直到此时，我才深深地舒了一口气。我看向猫咪，发现它的眼里流露出感激的神情，好像在向我致谢。接下来的几天里，我们还定时给猫咪换药。 一个月过去了，猫咪的伤口痊愈了!我和同事们都很高兴。接着，我们在网上发布了猫咪的信息，希望有人能收养它，并好好对待它。

不久，一对夫妇表示愿意收养这只猫咪 如果我是小动物保护协会的会员，我会为我的动物伙伴们做得更多更多!

Do something to protect the environment.We want to hold a green Olympic Games ,so everyone should do something useful to protect the environment ,whether it is big or small.

We should do something to stop people from doing bad things to the environment .We should put rubbish into dustbins instead of throwing it about. Everyone must care for flowers ,grass and tress in public .We shound collect things like paper ,plastic bags our neighborhood as well ,it’s necessary to plant more trees every year .

It is everyone’s duty to make our neighborhood much better with our hands minds .Let’s make a contribution to protecting the environment and the Plympic Games successfully.

[个人保护环境英语作文

When it comes to the environment, most people believe that now is in the shake head to sigh: water pollution, dust storm raids, white garbage everywhere... However, more and more people just sigh, but no action. Only when the sky is no longer clear our heads, remembered that should protect our environment? When we were at the foot of the land into desert, just regret not cherish the nature? I want to say, no, we can all start from to protect our school environment, from the small start bit by bit.

Go to school that day, I and several classmates said and laughed to sit into the corridor, see at a distance a cordial and familiar figure, when we miss zhao. Suddenly, she paused, with his head down as if found any. All of a sudden, she crouched down... Strange, she do? Is to tie his shoes? Or a sprained foot? We havent stepped forward, but she from his pocket a piece of facial tissue, hand a pinch, picked a piece of chewing gum on the ground up, wrapped up, and then threw it into the dustbin. She turned around and saw us strange eyes, smiled and said: "not surprisingly, dont say the whole school, even if lets class, if a person a piece of gum, we will be glued here. If everyone take good care of our environment, we can live in comfort."

Miss zhao said good, do better. I think I did pretty good also. For example, our class classroom environment, there are flower, grass, helped my contribution! Since as health group leader, I work hard, meticulous work. If I was in this respect "xiao-he only expenses furore," then I class "plant corner" career for me, but made great contributions

In the animal kingdom, both predators and prey species utilize one of two things to survive—stealth or speed. Both on land and beneath the sea, those who master either evasion or capture through these methods will thrive, living to reproduce and achieve the unspoken directive of their species. While stealth—through camouflage or evasion—is common, perhaps the most thrilling feature of many of the animals we find in the ocean are the fantastic speeds that can not only be achieved, but often maintained for long periods of time.Speed represents a tremendous expenditure, an investment of energy that must be replenished via consumed calories. Therefore, any observer should marvel not only at the existence of this trait, but also at the bounty of an ecosystem and the ability of individuals to draw their needs from that system. Their existence is a reflection of the fantastic diversity and abundance of our oceans. Here are ten of the fastest aquatic animals—both predator and prey.

动物世界里，不管是捕食者还是被捕食者，暗袭和速度是它们赖以生存的两大法宝。许多陆地和海洋生物正是通过这两项技能得以繁衍成长，维持在自然界中的生存地位。对于暗袭，大多数动物拥有独特的保护色和逃遁技巧，以此捕食或躲避天敌。然而，在海洋世界，失去遮蔽物和光线，速度才是生存王道。许多海洋生物爆发力惊人，不仅可以很快达到超高时速，更为赞叹的是凭借其惊人耐力能游行数小时。长时间竞速意味着巨大的体能消耗，需要通过摄入大量卡路里补充体力。因此，人们不仅会对这一特点感到惊奇，更会对它们身处生物系统底部却能以个体能力获得所需而惊叹不已。它们的存在就是海洋多样性及丰富性的最好体现。

In order to support Beijing to hold the 2008 Olympic Games and protect our environment,an activity was organized by the Young League and Students Union of our school during the week from June 3rd to June 8th.

All the students in the senior grades took active part in it.Some students cleaned the playground,watered the young trees and flowers,and removed weeds.Some students collected waste paper,old books,empty cans and old toys.They had them sorted and sent them to the recycling center.

The activity is really instructive.Now we all have realized how important protecting the environment is.

Great changes have taken place in peoples life in the past 20 years .In the past ,people kept in touch with relatives or friends mainly by sending. Letters ,they would listen to the radio for news and other information.Children used to go to school by bicycle .Big families had to share small rooms .

Now people can talk to others by telephone or on the Internet at home .When they are free ,they watch the news and other programmes on Tv .Some families are rich enough to send their children to school in their own cars . More and more people lives in big and bright apear ments with several rooms .

In a word ,people clveletter than before.

【参考译文】

在人们的生活发生了巨大的变化在过去的20年。在过去,人们与亲戚朋友保持联系主要是通过发送。信,他们会听广播新闻和其他信息。孩子们过去骑自行车去上学。大家庭有分享小房间。

现在人们可以在互联网上和他人交谈通过电话或在家里。当他们是免费的,他们在电视上看新闻和其他节目。一些家庭足够富裕,在自己的车送他们的孩子去学校。越来越多的人住在大而明亮的闪光的天际和几个房间。

总之,人们比以前好。

Cars and Air Pollution

Too many cars have created a lot of serious problems in our world. Besides congestion, accidents and fast fuel consumption, cars are responsible for a good part of air pollution in big cities. All the time, they are pumping huge amounts of waste gases into the atmosphere. These gases are very harmful, causing disease and even death.

One possible solution is to design and develop clean cars and clean fuels. In Shanghai, some of the public buses begin to run on natural gas, which does not give off as much carbon dioxide as the petrol. But it may take decades for the new models of clean cars completely replace the traditional ones. Another solution is to develop modern public transportation systems and restrict the use of private cars. If the price of petrol rises constantly and the public vehicles are efficient and convenient enough, most people will not buy private cars. And the total number of cars in big cities will reduce greatly.

On the whole, the elimination of air pollution needs the collective efforts from the government, the public and the environmentalists.

In recent years, there are more and more Confucius Institutes being built

all around the world, which shows that our Chinese culture become much more

popular than ever. As one of the four ancient civilizations, China has long

history and creates many splendid cultures. The ancient culture once had great

influence on the world, such as Japan, South Korea and other Asian and European

countries.

From the respect of school, Confucianism, Mohism, Taoism, and Legalism are

the main schools created in ancient China, and they also have great influence on

the Modern China and the world, especially the Confucianism. They deeply root in

traditional Chinese culture and people’s daily lives.

Specially, kung fu, traditional Chinese painting, poem, opera, cooking,

clothing, architecture and many other kinds of cultural forms make up the

splendid Chinese culture. The kinds listed above are the typical ones which

connect to each other at the same time. For example, painting, clothing and

architecture has many things in common. And each kind of cultural form contains

numerous intentions.

In short, Chinese culture are the accumulation of Chinese history, which

makes Chinese culture colorful and prosperous. If one wants to know or study

Chinese culture deeply, he or she must spend much time in it, otherwise he or

she can only get the tip of an iceberg.

今天下午，我打开电脑上了qq,，在qq空间里看见了“惊天地泣鬼神”的一幕。

一些人准备取小熊的胆汁，这时，一只母熊挣脱了铁笼，用巨大的熊掌掐死了小熊，然后把头撞上墙壁，死了。也许这是它们最好它们的办法，因为它们解脱了。

看完这一则故事，我快哭了。这么可爱的小熊，这么伟大的母熊，是谁狠心夺走了它们的生命？是人类。口口声声说保护大熊猫的是谁？也是人类保护濒危动物作文作文。这不是自相矛盾吗？大熊猫是我国的国宝，可一些熊猫看见人类就想逃。这是为什么？因为有人伤害熊猫。

熊猫是多么可爱啊！他们也有生命，它们不是致富的工具。我们一定要保护熊猫，一些熊猫已找到，还有一些熊猫还在受那无尽的痛苦折磨。我们要将心比心，假如自己是它们，受到这种痛苦会怎么样？

在这里，我呼吁大家：爱护动物，让动物不再惧怕我们，让这个世界变得真正和平吧！

同时我也奉劝那些伤害熊猫的人：熊猫也有生命，熊猫也有感情。它们的价值并不是让我们赚钱，而是为自己而活。希望你们能到此收手！

Hello, everyone. I’m am a student in No.1 Middle School. I’m very proud that I have been chosen to speak to you all today.How to protect/save our environment/world?

The environmental pollution is worse and worse /more and more seriously today. Water is polluted ,we have no clean water to drink Many trees are cutting down, some animals is getting less and less.Some factories is poring dirty air in the sky , the population is increasing faster and faster ,resources is getting less and less…etc. Not only does it affect our lives and health, it also has a great affection in the future.

The first fact I worry about is noise pollution. People can"t sleep well if there is too much noise. That"s why so many people prefer to live in the countryside rather than live in the noisy city. I suggest all the factories and cars shouldn"t make terrible noises. If they make terrible noise that isn"t allowed, they will be fined, and we can also produce the cars which can"t make terrible noise.

The other pollution is rubbish pollution. If everyone makes so much rubbish, one day we may live in a world filled with rubbish. Some people throw the waste paper about. I suggest rubbish should be put into different kinds of dustbins or paper bags.

[高中保护环境的英语作文

暑假时老师叫我们买了一本书——《逝者如渡渡》，我刚看到它，觉得名字很奇怪？我带着问题打开了书，我才明白“逝者如渡渡”成为西方一句哀伤的谚语，“渡渡”是一种已经灭绝的鸟，“逝者如渡渡”这句话是警示我们：工业大规模灭绝地球物种的开始。

看了这本书，我才了解到原来世界上还有一些奇特的动物，如：腿向大象的腿一样粗的象龟，肥胖可爱的渡渡鸟，浑身雪白的纽芬兰白狼，小巧玲珑的蜗牛飞鱼。它们曾经也和我们一样生活在温馨的大家庭“地球”。可是，因为人类的贪婪，它们从地球上消失了。

例如：已经灭绝的旅鸽，谁能想象到，它们曾是世界上鸟类数量最多的一个种族，数量曾达50亿之多。可后来欧洲人来了，它们滥杀旅鸽，他们折磨旅鸽。甚至有人想出了将旅鸽的眼睛缝上。他们大量捕杀旅鸽，杀掉旅鸽的数量，只不过是他们的比赛成绩。他们将鸽肉卖出去，能赚很大一笔钱。后来最后一只旅鸽“玛莎”死于美洲的一个动物园。这时人们才开始后悔，可是一切都晚了。谁能想象到，很久以前曾有鸟类学家预言：“旅鸽一定是世上唯一不会灭绝的生物。”

纽芬兰白狼本来与纽芬兰人相处的很好，可是喜好杀生的英国人来了，他们将好客的纽芬兰人赶尽杀绝，占领了纽芬兰岛，接着他们开始滥杀跟纽芬兰人有关的动物，他们在纽芬兰白狼的猎物上了下毒，最终，纽芬兰白狼在残忍的英国人手下灭绝了。

在我们的地球上，还有许多的动物也濒临灭绝，如：中华虎凤蝶、短尾猴、亚洲象……

同时我们也再用爱心杀害着动物，如：年年在外面卖的小鸭子，我们将它买回家，却在无形中伤害着它们。它们本应该在大自然的阳光下自由自在，可却被“喜欢”它的小朋友关在屋子里，养在箱子里，当成小朋友的玩具……

我们在电视上、草坪上有一条公益广告是对的“没有买卖，就没有杀害”我们在杀害甚至灭绝其他动物时，有没有想到是否也在伤害我们自己。地球是一个大家庭，我们要知道，人类并不是世界上唯一的生物。我们只要保护他们，爱护他们，就是保护我们自己，爱护我们自己，创造更美好的地球。

When the Arctic Ocean freezes over in the autumn, polar bears set off in search of their favorite meals: fatty ringed seals and bearded seals. By the summer, the sea ice begins to melt and break apart. Deprived of access to the tasty seals, polar bears spend the summer fasting. At least, thats whats supposed to happen. As the planet warms, the warmer ice-free season is getting longer and longer. So whats a hungry bear to do?

Scientists once thought that polar bears might survive by supplementing their pinniped diet by turning to terrestrial foods like snow geese, their eggs and caribou.

"Weve had this debate in the literature about whether terrestrial foods are nutritionally relevant to polar bears during the on-land season when the ice has melted."

University of Alberta biologist Nick Pilfold.

"And weve known for a long time, going back to research in the early 70s, even going to back to early explorer logs, that polar bears will consume terrestrial based foods. But the debate was always whether those foods actually add up, energetically." In other words, do these substitutes provide enough nutrition to make up for the lost seals?

To find out, Pilfold and his colleagues estimated the weight lost each day by polar bears in the wilds of western Hudson Bay during the ice-free season, when they could ostensibly be chowing down on terrestrial foods. Then they compared that to the weight lost by bears that are temporarily held in Manitobas Polar Bear Alert Program.

While captive, the bears do not eat. They drop about one kilogram each day. But the wild bears, who had access to the Arctic snack bar, lost the same amount of weight each day. The results are in the journal Physiological and Biochemical Zoology.

"Which is really saying that the terrestrial foods do not have dense enough energy to offset the mass loss. So this idea that bears can just switch from eating sea ice–based food to land food and thats going to help supplement against longer ice-free seasons, that really doesnt show up in the data."

The problem is that polar bears evolved to rely on the marine diet.

"The food on land is protein and carbohydrate based, and the food the polar bears really focus on is fat. Fat is the name of the game for these bears; theyre highly adapted to absorbing that fat into their system and putting it onto their body as body mass, so they can fast on it later on. And the only thing thats going to provide them with that type of fat are marine mammals. And they can only access those marine mammals when theres sea ice."

Adult males can go eight months without food. But younger, sub-adult bears, which are no longer nursing and must hunt, cant last as long without sea ice. So as the Arctic warms, younger polar bears will disproportionately die out. Leaving the species survival in doubt.

北冰洋在秋季结冰以后，北极熊就会出发去寻求它们最喜欢的食物：富含脂肪的海豹和胡子海豹。海冰在夏季开始融化断裂。这使北极熊在夏季无法吃到美味的海豹，所以它们进入禁食期。至少，情况应该是这样。但是由于地球变暖，温暖的无冰季节越来越长。那饥饿的北极熊要怎么办?

科学家曾经认为，北极熊可能会转向陆地上的食物来补充它们对鳍足类动物饮食的需求，进而生存下去，这些陆地食物包括雪雁、雪雁蛋和北美驯鹿。

“文献中有过这类辩论，即在寒冷融化时陆地食物是否能满足北极熊的营养需求。”

尼克·皮尔福德是加拿大阿尔伯塔大学的生物学家。

“通过上世纪70年代初的研究，还有早期的探险者日志，我们很早以前就知道，北极熊会以陆地食物为食。但是辩论的焦点在于，这些食物是否能增加北极熊的能量。”换句话说，这些替代食物能否为北极熊提供足够的营养，弥补不能进食海豹带来的损失?

为了解开这个疑惑，皮尔福德及同事对西哈德逊湾荒野地区的北极熊在无冰季期间每天失掉的体重进行了估算，从表面上看，北极熊在这段时间食用了陆地食物。随后，他们将这一数据与通过马尼托巴北极熊预警计划暂时捕得的北极熊所失掉的体重进行了对比。

在被关期间，北极熊不吃东西。它们的体重每天大约下降1公斤。虽然野生北极熊能享用北极“小吃”，但是它们的体重每天也同样会下降1公斤。这一研究结果发表在《生理学和生化动物学》期刊上。

“显然结果表明，陆地食物不能为北极熊提供足以抵消大量损失的能量。所以，北极熊可以从食用海冰下面的食物转向食用陆地食物，并帮助它们对抗日益延长的无冰季这个观点，并没有在这项数据中得到证明。”

问题是，北极熊进化成了依靠海洋食物的动物。

“陆地食物以蛋白质和碳水化合物为基础，而北极熊需要的食物以脂肪为主。脂肪是这些熊真正需要的东西;它们高度适应的情况是，将脂肪吸收进它们的系统中，然后把这些脂肪放在身上以增加体重，这样它们之后就可以依靠这些脂肪来度过禁食期。唯一能提供给北极熊这种脂肪的就是海洋哺乳动物。但是它们只能在有海冰时食用到这些海洋哺乳动物。”

成年北极熊可以8个月不进食。但是小一些的未成年北极熊已经不再被哺育，它们必须要去猎食，可是它们不能在漫长的无冰季期间一直不进食。所以，随着北极地区变暖，较小的北极熊将会大批死亡。这使这些物种的生存成为问题。