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. My friend (likes) pies. He (eats) pies every day. When I (met) him in the street yesterday, he (was eating) a pie. He (told) me that he (had bought) that pie at the corner of the street. Look at my friend now! He (is eating) a pie again.
2. I always (come) to school at a quarter to nine.
3. Yesterday I (came) to school at ten minutes to nine.
4. Tomorrow Nick (won't go) to the cinema because he (was) there yesterday. He (has already been) to the cinema this week. He (will stay) at home and (will play) a computer game.
5. What (is your brother doing) now?
6. My father (works) in an office. It (is) Sunday now. He (isn't working) the office, he (is reading) at home.
7. I (haven't seen) you for a while! (Have you been) busy at work? - I (have had) an awful week, you (know).
8. What (was he doing) at ten o’clock last night?- He (wasn't doing) anything really. He (was just looking) at some magazines.
9. We (are having) rather a difficult time at the moment. - I (am) sorry to hear that.
10. Something awful (has happened). Her little daughter (swallowed) a coin.
11. She (asked) me if I (had seen) her backpack.
12. After the boys (do) all the work, they (will go) to the theatre. или After the boys (had done) all the work, they (went) to the cinema