Underline the appropriate time phrase and put the verbs into the correct tense. New research offers proof that global warming is a direct consequence of man′s activity on earth and not a result of some unidentified natural phenomenon. 1) (After/As soon as) noting climate changes on computer, researches 2) ……. (show) that the Earth′s average temperature has risen by 0.7 C 3) (before/since) the Industrial Revolution. 4) (While/As soon as) the results were published, climate changes once again 5) ………. (become) headline news. Other research predicts that 6) (by/by the time) the end of the century average rainfall will be 30% higher than today as a result of a warmer climate. Air pollution is blamed for a sharp rise in the Earth′s temperature and 7) (until/whenever) strict law 8) ……….. (be/introduced), the problem will continue to get worse. Something needs to be done 9) (the moment/before) it 10) …….. (be) too late. 11) (When/Whenever) EU countries 12) ………..(meet) last month, they agreed to cut down on pollution levels. 13) (Just as/Once) clean sources of power 14) ………… (be/developed), we will have taken the first steps towards stopping global warming.

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