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懂你英语L3-Unit31-1 Life & Condition

懂你英语L3-Unit31-1 Life & Condition

作者: Angelalia | 来源:发表于2018-09-22 09:26 被阅读0次

1.

There are many forms of life on earth, including human beings.

Life exists in a variety of conditions.

Some forms of life live in a watery environment, like the oceans.

Other forms of life can be found  in very dry areas like deserts.

However, for any form of life to exist, conditions must be right.

When conditions are not right, that form of life will become extinct.

To become extinct means to die out completely.

2.

Conditions must be right for life to exist.

Millions of years ago there were forms of life that no longer exist.

When conditions changed, these forms of life died out.

One extinction event happened about 250 million years ago.

This was the largest extinction event of all time.

Many forms of life became extinct.

96% of all life in the oceans died out.

Most insects also became extinct.

This event happened over a period of several million years.

3.

The causes of this extinction event are still unknown.

Possible causes include large volcanic eruptions and global warming.

Some scientists believe that there were several causes.

They believe that a series of events caused the extinctions.

Scientists are working to better understand what really happened.

4.

In modern times, we humans face changing conditions.

For humans to live, we need clean air and clean water.

Pollution is now a growing problem around the world.

Pollution poisons the air and water that we depend on.

Polluted air makes people sick and afraid to go outside.

Polluted water poisons our food supply.

As a result, we never know which foods are safe to eat.

Human beings can not live in a poisoned environment.

Therefore, pollution is a major threat to our existence.

5.

Humans need temperatures to be in a comfortable range.

To be in a comfortable range means to be neither too hot nor too cold.

With global warming, global temperatures are rising.

As temperatures rise, the polar icecaps will melt.

As the polar icecaps melt, ocean levels will rise.

Areas of some countries will soon be under water.

People will be forced to relocate from flooded areas.

6.

In nature, even small changes can sometimes have large effects.

It’s difficult to predict what’s going to happen.

The entire ecosystem that we depend on is changing.

Some of these changes are irreversible.

Irreversible changes can not be undone. (because they cannot be reversed)

7.

Let’s hope that humans are smart enough to understand how the world is changing.

With more understanding, we can make better choices about what to do.

We can face the challenges of pollution and global warming.

We need to do this before it’s too late.

This planet Earth is our only home and we need to protect it. (the planet’s environment)

(We need to protect the environment that supports us.)

Pollution

In modern times, we humans face changing conditions.Pollution is now a growing problem around the world.

Exhausts gases form automobiles are a major cause of air pollution and global warming.

Pesticides and fertilizers are used  to grow corps, This chemicals pollute the water supplies when they flow into guound or rivers.

Some Factories  allow harmful chemicals to get into air or water.

Nuclear waste products are radioactive and can pollute the environment for thousands of year. They need to be safely transported and stored in a safe place.

 For humans to live, we need clean air and clean water. 

Pollution poisons the air and water that we depend on.

Polluted air makes people sick and afraid to go outside.

Polluted water poisons our food supply.

As a result, we never know which foods are safe to eat.

Human beings can not live in a poisoned environment.

Therefore, pollution is a major threat to our existence.

 As a result, many companies are trying to produce more efficient and cleaner cars. We need to try harder to protect the environment and our health.

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