. Complete the sentences using the correct tense of the verb.
1) Unless global emissions (to be) _____ reduced, huge areas of land (to be) _____ flooded
and the world economy (to collapse) _____. By 2050 up to one million species (to become)
_____ extinct due to the loss of natural habitats.
2) If only we (to use) _____ the water we need, we (contribute) _____ to our planet's recovery.
3) In case we (to keep on) _____ using more and more cars, we (to run out) _____ of oil.
When (to run out) _____ of oil, we (to need) _____ other kinds of energy.
4) We (to save) _____ thousands of trees if we (not to waste) _____ so much paper.
5) Pollution (to increase) _____ if we (to use) _____ more oil and coal. If pollution (to increase)
_____, more and more trees (to die) _____. The climate (to change) _____ if more trees
(to die) _____.
6) If we (to try) _____ to control pollution, it (be) _____ very expensive. Unless we (control)
_____ pollution soon, it (to be) _____ too late.
7) Providing we (to recycle) _____ more, we (to help) _____ our planet.
8) As soon as people (to share) _____ their cars to go to work, there (not to be) _____ so
many car fumes.
9) Until the government (to fine) _____ those who pollute the atmosphere, some factories
(to stop) _____ throwing waste into rivers.
12. Complete the second sentence with the word in brackets so that it has the same
meaning as the first one. Use from 2 to 6 words.
1) Air pollution can go down by decreasing carbon emissions. (AS SOON AS)
_______ we decrease carbon emissions ___________________.
2) It's unlikely that the impact of global warming will be reduced in the future because we're
not taking action now. (UNLESS)
_______ we __________________ reduce the impact of global warming.
3) Travelling by train produces only 12.5% of the emissions of a flight. (WHEN)
___________________, we only produce 12.5% of the emissions of a flight.
4) You can offset your carbon emissions by paying an organization to reduce CO2 in the
atmosphere. (PROVIDING)
_________________ to reduce CO2 in the atmosphere, you will offset your carbon emissions.
5) Buying food from Africa will make Africans richer. (IN CASE)
________we stop buying ___________________ make them poorer.
6) Only by working together will the situation improve. (UNTIL)
The situation _________________ we all work together.