英语流利说 Level 4 Unit 2-1 Extinction Events 2

Scientists estimate there have been at least 5 mass extinctions in the last 540 million years.

They also believe that we have entered a new extinction event.

Species are becoming extinct at a much faster rate than before.

Instead of asteroids or volcanic eruptions,the current event is the result of human activities.

Human activties for example have lead to global warming.

Global warming is the result of an increase in carbon gases in our atmosphere .

These gases trap heat from the sun so the earth is getting warmer.

As a result,sea levels are rising and weather patterns are changing.

In addition we humans are destroying the habitats of many plants and animals.

Cutting down the forests and polluting rivers destroys the habitats of many forms of life.

There is no longer any doubt that this is happening.

Species of life are disappearing at an increasing rate.

Global tempratures are rising and weather patterns are changing.

Scientists are warning us that fast action is necessary to save our future.

If we don't act we may go the way of the dinosaurs.