Scientists have known about the greenhouse effect since 1824, when Joseph Fourier calculated that the Earth would be much colder if it had no atmosphere.
The rapid rise in greenhouse gases is a problem because it is changing the climate faster than some living things may be able to adapt.
Also, a new and more unpredictable climate poses unique challenges to all life.
As the mercury rises, the climate can change in unexpected ways.
In addition to sea levels rising, weather can become more extreme.
Scientists have known about the greenhouse effect since 1824, when Joseph Fourier calculated that the Earth would be much colder if it had no atmosphere.
The rapid rise in greenhouse gases is a problem because it is changing the climate faster than some living things may be able to adapt.
Also, a new and more unpredictable climate poses unique challenges to all life.
As the mercury rises, the climate can change in unexpected ways.
In addition to sea levels rising, weather can become more extreme.
1. I won't go to speak to her until she apologizes.
2. Martin asked me if I would help him with English.
3. We will have driven over five hundred kilometers by the time we reach the border.
4. You will be sick if you eat more chocolate.
5. Look out! We are going to hit the car in front.
6. Don’t phone too early because I will be putting the baby to bed.
7. By the time I qualify I will have studied law for six years.
8. He was not quite sure when his parents came home.
9. Bob didn’t know if the time-table for the next week would be changed.
10. By the time you get back, all the food will have gone.
11. You won't be able to enter the building if you don't have your identity card.