我的家庭高中英语作文 高三【经典20篇】

示例：

Dear______,

I am writing to extend my sincere gratitude for ________(感谢的原因). If it had not been for your assistance in _________(对方给你的具体帮助), I fear that I would have been_________(没有对方帮助时的后果).

Every one agrees that it was you who__________(给出细节).

Again, I would like to express my warm thanks to you! Please accept my gratitude.

Yours sincerely

Li Ming

Currently,self-confidence has become the order of our life, which improves the theorythat nothing is more valuable than self-confidence.

如今，自信已经融入了我们的生活中了，这也就证明了没有什么能够比自信更有价值。

Itis obvious that self-confidence means trust in one’s ability. If we are full ofself-confidence, we’ll have creative power to live and work, helping us successor dreams come true. On the contrary, if we have no confidence in ourselves,there will be little possibilities for us to win. We’ll always face failure.

很明显，自信意味着对一个人能力的信任。如果我们充满自信，我们在生活和工作中就会有创造力，帮助我们成功或者实现我们的梦想。相反，如果我们对自己没有信心，我们取胜的可能性就很小。我们总是要面对失败。

What’smore, no one can deny another fact that self-confidence gives us light when wewalk in the dark and courage when we face stumbling blocks. Withself-confidence, we can achieve goals in our life.

再者，没有人能否认这样一个事实，当我们游走在黑暗时，自信能能给予我们光明，当我们遭遇不顺时，自信能给予我们勇气。有了自信我们可以实现生活中的目标。

[高中英语作文：自信的重要性

范文：

Travel is a very good means of broadening a persons perspective. It makes you come into contact with different cultures， meet people of different colors and go through peculiar rites and ceremonies. Travelling much， you will not only enrich your knowledge and experiences， but also be aware of the vastness of nature.

Travel may also relieve person of boredom and gloom. Travel brings you enjoyment and attraction. It gives you a pleasant experience， which will disperse your boredom and make you forget whatever annoys you. Travel broadens your mind and leaves you good memories. Later， you may go over these memories and enjoy your past experiences， thus keeping a fresh and sunny mind.

整理:

The fields his study， nature was his book.

Travelers can choose different modes of transportation which have advantages and disadvantages. Airplanes are the fastest but also the most expensive. Buses and trains are less expensive， but they soon make you feel cramped and uncomfortable. Ships provide you with comfort unless you get seasick. Most people can afford traveling by bicycle， which， although slow， can limber up your muscles and get you closer to nature.

四川省汶川县有一位工程师，在他33岁的时候，妻子患了重病。生命垂危的一刻，妻子紧紧地握着他的手说：“你一定要照顾好我们7岁的儿子，把他养大成人……”他含泪点头答应。工程师为了不让儿子受到委屈，就一直没再婚。他细心地照顾、关爱儿子。儿子也很争气，在四川北川中学，学业成绩名列前予。工程师自己在工作上也是勤勤恳恳。

几年后，他升任高级工程师。2008年5月12日14时28分04秒，他儿子正当在课室学习准备考大学的时候，却遭遇5.12四川汶川大地震，教学楼瞬间倒塌。他儿子和全班的同学一样，失去了年轻宝贵的充满着希望的生命。他痛苦至极。工程师从小失去父母，年轻时又失去了至爱的妻子，儿子成为他全部希望。想不到，如今人到中年，又失去了心爱的儿子。他每天下了班就孤零零的一个人，面对着天空发呆。他默默地想，也许这个世界上，他再没有一个可以牵挂的人，也许再没有一个人来牵挂他了。

他越想越伤心，越想越绝望。他已经是高级工程师了，他并不缺钱。但他身边再没有一个亲人让他去关心和爱护。他孤身一人来到江边，拿了两罐啤酒，边走边喝，想麻醉自己，然后跳进波涛滚滚的江水里。这样，他就会永远告别这种孤单和痛苦的生活。两罐啤酒落肚，他扔掉手中的啤酒罐。这时，已经是晚上11点了。忽然，他看到不远处有个衣衫破烂的老大娘拄着拐杖，艰难地走过来，捡起他扔掉的啤酒灌，小心地放进背上的垃圾袋里。看着这个捡破烂的老大娘，他忍不住问：“大娘，您没有和您儿子一起住吗？为啥子这么晚了还在捡破烂？”

老大娘深深地吸了一囗气说，她儿子在抗震中英勇牺牲了，她现在是一个孤零零的老婆子，只有一个7岁的小孙子，等着她来照顾。老大娘的背已经很驼了，70岁的老人，却要照顾一个年仅7岁的小孙子。工程师的脸上忽然流下了眼泪，他心里想，自已从小没有父母，为什么不可以像儿子一样照顾这个老人和她的小孙子呢？他走过去扶住老大娘说：“老大娘，我从小没有父母，现在孤身一人，如果您不嫌弃，我可以做您的儿子来照顾您……”

从此，工程师与这位老大娘和那个7岁的小男孩生活在一起。他给这位老大娘买来新衣服，再也不让她去捡破烂；他给7岁的小男孩买新书包，把这小男孩送去自己亲手绘图设计和亲自到建筑施工现场把关的，新建设好的学校去读书。后来老大娘告诉他：“这个7岁的小男孩是我在地震之后的废墟上捡来的，这小男孩的父母已经在地震中被埋在废墟里面丧生了，当时这小男孩已是奄奄一息，我看他怪可怜的，就……”

三个没有血缘关系的人组成了一个家庭。对这个三合一家庭，工程师高兴地说：“这是天官赐福！”他每天下班回到家，都会先喊一声：“妈，我回来了！”这时，老大娘就会端出做好的热腾腾的饭菜给他吃。有时加班晚了，大娘会把饭莱热在锅里，手里做着针线活等他回来。小男孩常常拿着100分的试卷，嘴里喊着：“爸爸！爸爸！我又得了100分！”工程师抱起“儿子”用嘴边吻“儿子”的脸边说：“我的儿子是好样的！”一家人生活在一起，其乐融融。

最后，请让我许愿：愿在地震中的遇难同胞们安息；愿在抗震救灾中英勇献身的烈士们永垂不朽；愿灾难不再发生；愿人间永远美好；愿工程师这个三合一家庭和天下所有的家庭永远幸福、平安、祥和！

I still remember the first time I went to the zoo.

When I was only five years old, my mother took me there.We took the camera and went to the station together. There were so many monkeys, tigers, lions, wolves and other animals in the zoo. We took many photos in the zoo with the animals. I was pleased to see so many real animals at the same time. They seemed so lovely and active.

I spent a nice day. But on my way home, I began to feel sorry for them. They were taken away from their parents and friends and also far away from the nature. They must have felt lonely, I thought. Every day, the only thing they could do was to sit there and wait for food.

我仍然记得第一次去动物园的那一天。

5岁那年，妈妈带我去动物园。我们带了相机一起过去。那里有猴子、老虎、狮子和狼等等，我们跟它们照了很多相。我很高兴能同时看见那么多活灵活现的动物，他们看上去又活泼又可爱。

我度过了快乐的一天。可是在我回家的路上，我开始替它们难过起来。人们把它们从父母和朋友身边捉走，它们一定感觉很孤单，我想。它们每天惟一可做的事就是等着人们来喂食。

导语：每到一个新班级都要进行一次自我介绍，你会用英语介绍自己吗?下面是yuwenmi小编为大家整理的相关英语作文，欢迎阅读与借鉴，谢谢!

Teachers，good afternoon.

Allow me to briefly talk about myself. My name is - xx graduated from the south gate of the private secondary schools. Tourism now studying at the school in Hubei Province. Studying hotel management professional. I was a character，cheerful girl，so my hobbies is extensive. Sporty. In my spare time likes playing basketball， table tennis，volleyball，skating. When a person like the Internet at home，or a personal stereo. Not like too long immersed in the world of books，and family members have told me，Laoyijiege is the best. Talking about my family，then I will talk about my family has. Only three people my family ， my grandmother ， grandfather and my own. My grandfather is a engineer，I am very severely on peacetime，the Church me a lot. Grandma is a very kindly for the elderly，care for my life in every possible way. Therefore，I have no parents in their care，childhood and growth were full of joy. I like this hotel management professional，because I like to live in a strict order of the management environment. I have my professional self-confidence and hope，as long as the efforts will be fruitful，this is my motto. Since I chose this profession，I will follow this path，effort，perseverance path.

Thank you teachers. I finished presentation.

【参考翻译】

老师,下午好。

请允许我简单介绍我自己。我的名字是——毕业于xx私立中学。现在在这所湖北省旅游学校学习。学习酒店管理专业。我是一个性格开朗的女孩,所以我的爱好是广泛的。运动。在我的业余时间喜欢打篮球,乒乓球,排球,溜冰。当一个人喜欢在家上网,或者一个听随身听。不喜欢太长时间沉浸在书的世界里,和家人告诉我,劳逸结合是最好的。谈谈我的家庭,然后我将谈谈我的家人。我的家庭只有三个人,我的奶奶,爷爷和我自己。我的祖父是一个工程师,我非常严重在和平时期,教会我很多。奶奶是一个非常和善的老人,照顾我的生活在每一个可能的方式。因此,我没有父母的照顾,童年和成长都充满了快乐。我喜欢这个酒店管理专业,因为我喜欢生活在一个严格的秩序的管理环境。我有我的专业自信和希望,只要努力将是富有成效的,这是我的座右铭。既然我选择了这个职业,我将遵循这条道路,努力,坚持不懈的路径。

谢谢你老师。我完成了演示。

i do the normal routine, eat dinner, clean the house, write-the usual stuff. and then i lay down hoping to fall asleep quickly so my new day will hurry up and arrive. a new day with a brand new sun. but as i lay there and wait for the world to turn half way around, i think about her. and sometimes i smile, and sometimes that smile will turn into asnicker, and then often that snicker will turn into a burst of laughter.

我按平时的规律吃晚餐、打扫屋子、写作--做着日常事务。然后我躺下，希望能快点入睡，新的一天就能快点到来--拥有新生太阳的崭新的一天。可当我躺在那儿，等待着世界的日夜回转时，我想到了她。有时我会笑起来，有时那微笑变成了窃笑，然后窃笑又常常变成爆笑。

There is an old saying that no one is perfect, so everyone will make

mistake sometimes, though we want to do best. When we make mistake, we must say

sorry to others, for the purpose of showing our regret, so that they will

forgive us and continue to keep in touch with us. Some people think apologize

will lose their faces, so they choose not to say sorry.

A wise person will make

apologize in a natural way and let the past be past, the good way to apologize

can help people feel easy. People can find the chance to apologize when they are

having communication, they can make the topic about apologize and then saying

that he is sorry about what he have done, so everything will seem easy.

Apologizing will promote people’s communication and keep their friendship. So

don’t feel losing face, just admit what you have done wrong.

My name is zhangyifan, this year 15-year-old boy, my special features is writing.I am an introverted person, very happy can spend a junior high school with everyone .I hope in the future day can spend amusedly with everyone for three years, increasing a perfect but substantial recollection for our lifes!

This weekend, there was an art festival in our school, it had been hold for

five years and the school insisted to make it become the feature. I was so

excited, this was the first time for me to join. Early in the morning, I saw

there were so many people coming to the campus, making the campus so lively. The

students dressed so well and gave the warm welcome to the guests. I walked

around and appreciated the painting, every work was drawn by the students, I was

so impressed by these works. There were also some handworks, which were so

creative, it reflected the students’ wisdom. Though we were busy with our

subjects most of the time, some students still kept on their hobbies and made it

their talent. I should learn from them and develop some interest.

Once， when I was a teenager， my father and I were standing in line to buy tickets for the circus. Finally， there was only one family between us and the ticket counter.

This family made a big impression on me. There were eight children， all probably under the age of 12. You could tell they didnt have a lot of money.

Their clothes were not expensive， but they were clean. The children were well-behaved， all of them standing in line， two-by-two behind their parents， holding hands. They were excitedly jabbering about the clowns， elephants， and other acts they would see that night.

One could sense they had never been to the circus before. It promised to be a highlight of their young lives. The father and mother were at the head of the pack， standing proud as could be.

The mother was holding her husbands hand， looking up at him as if to say， "Youre my knight in shining armor."

He was smiling and basking in pride， looking back at her as if to reply， "You got that right."

The ticket lady asked the father how many tickets he wanted. He proudly responded， "Please let me buy eight childrens tickets and two adult tickets so I can take my family to the circus."

The ticket lady quoted the price. The mans wife let go of his hand， her head dropped， and his lip began to quiver. The father leaned a little closer and asked， "How much did you say?"

The ticket lady again quoted the price. The man didnt have enough money.

How was he supposed to turn and tell his eight kids that he didn‘t have enough money to take them to the circus? Seeing what was going on， my dad put his hand in his pocket， pulled out a $20 bill and dropped it on the ground. (We were not wealthy in any sense of the word!)

Since I go to high school, I live in the school and stay away from my parents. I have three roommates, at the beginning, we have trouble in staying in the same room, but now we have got used to it.

One of my roommates impresses me so much, since she comes to our room, she keeps the habit of reading the novel when we go to bed. She told me that when she lived with her parents, she dared not to read it because her mother would blame her for sleeping late. Now she is very happy that she is out of control, it seems that she is free.

But I feel sorry for her, because she is short-sighted now, what’s more, she is lagging behind other students in the study. Staying away from her parents, she is not strong enough to behave herself. We should have the strong will and behave ourselves.

自从我上了高中，我就住在学校，远离父母。我有3个室友，刚开始，我们不习惯同处一室，但是如今，我们已经习惯了。有一个室友让我印象很深刻，自从她住进我们的房间，她就在我们睡觉的时候保持看小说的习惯。她告诉我们在她和父母住在一起的时候，她不敢看小说，因为她妈妈会责怪她那么晚睡觉。如今她很高兴再也不受控制了，似乎她得到了自由。但是我为她感到遗憾，因为她现在已经近视，而且，在学习方面也落后于其他同学。离开了父母，她不够强大，无法自律。我们应该有坚强的意志，并且自律。

[高中英语作文：坚强的意志

Nobody knows what time is like,for we cannot see it,nor can we touch it.Time is abstract,which we can only imagine in our mind.

But we do know that time passes very quickly. Some students,however,do not know the value of time,nor do they know how to make the best use of it,for they waste it in going to films,playing games and doing other useless things.Why do we go to school early in the morning? Why do trains run so fast? Why do most people prefer taking buses instead of walking? The answer is very simple: we wish to save time because time is precious.

Today we are living in the twentieth century. We know that time is life.When a person dies,his time has ended.Since life is short,we must devote our time and energy to our studies so that we may be able to serve our country and the people. But since time is invisible,we often neglect it. Lazinss. is the thief of time,for lasiness not only brings us a lot of harm,it also brings us failure. If it is necessary for us to do some work today,let us do it today and not leave it until tomorrow. Remember that time is more valuable than money.

[参考译文]

谁也不知道时间是什么样子，因为我们既看不见它，也摸不着它。时间是抽象的东西，我们只能凭脑子去想像它。

但是我们的确知道时间流逝得很快。然而，有些学生却不知道时间的价值，也不知道如何充分利用时间，他们把时间浪费在看电影、玩游戏和其他一些无聊的事情上。我们为什么一大早要去上学呢?火车为什么跑得那么快?为什么大多数人愿乘汽车而不愿步行办事呢?答案非常简单：我们想节约时间，因为时间非常宝贵。

如今我们生活在20世纪，我们知道时间就是生命。当一个人去世的时候，他所有的时间便用完了。既然生命短暂，我们必须把时间和精力用于学习，以便为祖国和人民服务；但由于时间是看不见的，我们经常忽视它。懒惰是时间的盗贼，它不但给我们带来许多危害，也会使我们失败。如果今天我们有什么要做的工作，让我们就把它做完，不要拖到明天。记住时间比金钱更宝贵。

Nowadays, house husband has become a hot phenomenon in modern society. As

we all know that no matter what country, it’s a tradition that men play a core

role in family who always take the burden to earn money to support their family.

But things are kind of different as society develops, more and more men are

beginning to take over housework while women go out from house. In my point of

view, I think this is not a big deal.

In the first place, house husband may be a shame title for men, but when it

comes to money, there is no room for reputation. As society develops, the life

standard are rising, and everything for living is much expensive than before, if

couples want to guarantee their life quality, then they should let the one who

earn better to work, although the one is female.

In the second place, it’s fine for women to support family as long as they

earn better than men. In the past, women always were treated very badly, and

they got no rights to be educated, to work. In some countries, they can’t even

show their face to others. A traditional female role is to stay at home, taking

care of children and do all of the housework. But now, lots of women have a good

job, so that they totally have the ability to be the economic backbone.

Therefore, in order to take good care of family, men are likely to stay at home

to do housework. I don’t think it’s a shame for men, because no matter what you

do, as long as you do it well, you are successful.

To sum up, people should change their opinion about core role of a family.

It’s acceptable for women to support the family, and there is no shame for men

to do the housework. As long as you remember life quality comes first.

With the development ofscience and technology ,different kinds of pollution has been produced andcaused global concern recently.

As we know, people have beenliving on the earth for thousands of years, human activity damaged natural environment, such as excessive abuse of natural resources ,the sewage dischargedfrom factories ,the animal slaughter ,kinds of chemical fertilizers andgreen-house effect. All that is mentioned above has a bad impact on the eco-system .Now, many animals aredying out. We are suffering from unhealthy food and water, we are faced withharmful rays and global warming. It was ourselves who had made a series oftroubles. As you can see, we are the final victim.

Above all, if we human beings cannot recognize theseserious problems and try our best to solve them soon, we would finally lose theenvironment suitable for us to live. So, it is our duty to protect theenvironment ,but what should we do to protect it?

In my opinion, the first and important thing is tounite all forces ,that is to say---gather all hearts together. Next we shouldprotect and plant more trees, which can dispose of the dust in the air. As forfamilies, it is effective to ride bicycles rather than drive cars. Don’t litteranywhere as you like. In addition, sorting and recycling the rubbish also playan essential role in the protection of our earth. We’d better call on everyone aroundus to lead a low-carbon life, as it may make a difference to the environment.

Thus, it’s high time that we did something to improveour surroundings. Everybody should raise the awareness to protect our motherearth. Let’s appeal to more people to join us.

All in all ,there’s no doubt that keeping the balanceof human and nature ,we will benefit a lot.

I have a big family. There are four people in my family: my mother, my

father, my younger brother and me. Oh, there is also a dog named Buddy lives

with us. My mother is a Chinese teacher, and my father is a lawyer. My little

brother and I go to the same school. On weekday, my father sends us to school;

while mother help us with our homework. My favorite thing is to play with our

dog, Buddy. If we have enough time, we will take him for a walk. I love my

family.

I dont remember how many examinations Ive taken since I began my schooling. Truth to tell, I dont like examinations at all. I dare say that, in fact, no student likes examinations.

We often hear people say “Examinations are teachers magic weapon”, so most of us may think it is our teachers who give us students so many examinations. But I dont think so. Almost all of them have once been students before they became teachers. We dont like examinations, and neither do our teachers, which may be reasonably concluded. Whats more,the more examinations we take, the more time will be taken from our teachers and the more troubles our teachers have to take.

It is the system in our country, I think, that gives us students so many examinations. If there were no entrance examinations, and all the students could go up to the higher grades without competition, there would not be so many examinations in primary and middle schools. So it is important and necessary to reform the entrance system. Only in this way can examinations be GREatly reduced, and then all the students will be happier.

终于等到了星期五，我们一家早早的来到了爷爷家，开始了一星期一次的家庭聚会，向我们这个大家庭里的首脑人物——爷爷，汇报这一个星期的学习和生活情况。（当然更主要的是见我的弟弟）

一进家门，我的弟弟就和我来了个“美国式”的拥抱，向大人们问过好后，我们就迫不及待的拿出自己的秘密武器——陀螺开始对战。没过多久便开饭了，今天的菜可真丰盛啊！有绿油油的青菜、红黄相间的西红柿炒鸡蛋、排骨汤、诱人的虾子、还有我最爱吃的糖醋排骨，看得我直流口水，这时妈妈叫我帮忙盛饭，当我拿碗回来时看见弟弟的小嘴鼓鼓的，“哇，你偷吃，太不够意思了。还兄弟哪？”我大声叫道，“嘘，小声点，我只是尝尝味道，要不你也试试？”我经不住诱惑，连忙也煎了一个排骨放到嘴里，啊！那酸酸甜甜的味道从我的喉咙直到小肚子，太美味了！弟弟看着我陶醉的样子问我：“怎么样？”我都没空搭理他，直接又夹了一块放进嘴里，他也不甘落后，加入到“消灭排骨”的队伍中来。

等到大家全部到齐开饭时，一盘排骨只剩下一点点了，奶奶开玩笑的说：“哎呀，我们家的两只小狗把骨头都要啃完了！”我们听了之后哈哈大笑。

一次愉快的聚会就这么结束了，我们依依不舍的离开了爷爷家，我们俩和奶奶约好，下次再多烧点排骨，我们要一次吃个够，因为奶奶的手艺太棒了！

"I now declare the rules of the game: a man hides a few things, and a few others go and hide them," said the town. We drew a lot and finally decided to hide three coke bottle caps from our cousin. The cousin pushed us out of the room and hid things by herself... After a while, the cousin came out with a smile and said, "hide it, you cant find it!" We swarmed in, and I thought: the easiest place to hide is probably the most secluded place. So, I will seriously every corner to find it again, did not, in the look at the kid sister, drill under the bed, their tails on the outside, groping hands in it, no, she just want to stand up, "alas!" The little sister cried, and she cried, and she stood up under the bed and hit the bed.

So she stopped the game. Ah! One less opponent, but the cousin is also difficult to deal with, see her in the closet to each piece of clothing to turn over, wow! Not yet! But where exactly? I glanced around, and then I noticed a shiny object behind the curtain.

I pulled the curtain aside. Coke bottle caps! I was happy to jump three feet high, my cousin saw, a look of unconvinced. But shes picking up speed. Look for it here. I made haste, and under the bed and then watch out of the reach of little younger sister, and I found a coke bottle caps, my heart even more excited to get up, then I have found in a book under the last bottle. "Shout! It took me a lot of work! I sighed and said, my cousin, my cousin and my sister are all happy for me. The cousin said, "you are very observant!" I heard it, I was very happy.

May 12th is an ordinary day in 2008,itis in this day that shocking earthquake happened in Sichuan province,China.The earthquake destroyed nearly everything in Wenchan county Sichuan province. It was terrible.We cant describle the scene what we saw with any words.thousands of people were injured even died. And thousands of children became such unlucky ones who lost fathers or mothers , they longed to have families to continue their lives .I am sympathetic to their fate ! But I believed that we can fight against the fate and change it .For example ,there many people keeping living without food or water for about 100 hours during the earthquake!

What an unbelievable thing it is !their great spirits showed the powerful life vitality of humans!However,they must keep fighting against the death .Many schools were destroyed and there were many students and teachers who left us forever.Sadness,hoplessness and different kinds of danger spreaded out here and there !

But ,fortunately ,love is around us :the Communist party helps us ,the army helps us ,the people all over the world help us .They offer us with money ,goods ,love and so on !For example ,li lian ji, a warm-hearted man ,offered us with 20 million yuan !

With the help of the such a large love ,we will over come the damage of the earthquake and face our beautiful future !

2008年5月12日是一个平凡的一天,它在这一天,令人震惊的地震发生在四川省,中国。地震几乎毁了一切在Wenchan县四川省。这是可怕的。我们不能简述现场我们看到任何单词。成千上万的人受伤甚至死亡。和成千上万的儿童成为不幸的人失去了父亲或母亲,他们渴望有家庭继续他们的生活。我同情他们的命运!但是我相信我们可以对抗命运和改变它。例如,有很多人保持生活没有食物或水约100个小时在地震!

什么不可思议的事情啊!人类的伟大的心灵表现出强大的生命活力!然而,他们必须对抗死亡。许多学校被毁,有许多学生和老师永远离开了我们。悲伤、hoplessness和不同种类的危险到处传播出去!

但是,幸运的是,爱是在我们周围:共产党帮助我们,军队帮助我们,全世界的人都帮助我们。他们给我们钱,商品、爱等等!例如,李连,一个热心的人,给我们2000万元!

的帮助下如此大爱,我们将在地震的破坏,面对我们的美好未来!

Oceans becoming more acidicThe worlds oceans are slowly getting more acidic, say scientists.The researchers from California say the change is taking place in response to higher levels of carbon dioxide in the atmosphere.The lowering of the waters pH value is not great at the moment but could pose a serious threat to current marine life if it continues, they warn.Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature.Increasing use of fossil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater.

Once in the water, it reacts to form carbonic acid.Scientists believe that the oceans have already become slightly more acidic over the last century.But these researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change."This level of acidity will get much more extreme in the future if we continue releasing CO2 into the atmosphere," said Dr Caldeira."And we predicted amounts of future acidity that exceed anything we saw over the last several hundred million years, apart from perhaps after rare catastrophic events such as asteroid impacts."If carbon dioxide release continues unabated, ocean pH could be reduced by as much as 0.77 units, the authors warn.It is not absolutely clear what that means for marine life, however.

Most organisms live near the surface, where the greatest pH change would be expected to occur, but deep-ocean lifeforms may be more sensitive to pH changes.Coral reefs and other organisms whose skeletons or shells contain calcium carbonate may be particularly affected, the team speculate. They could find it much more difficult to build these structures in water with a lower pH.In recent years some people have suggested deliberately storing carbon dioxide from power stations in the deep ocean as a way of curbing global warming.But Dr Caldeira said that such a strategy should now be re-considered."Previously, most experts had looked at ocean absorption of carbon dioxide as a good thing - because in releasing CO2 into the atmosphere we warm the planet; and when CO2 is absorbed by the ocean, it reduces the amount of greenhouse warming.