Lost Opportunities: Conditional III

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Complete the sentences with the correct forms of the verbs. Use Conditional III: If + Past Perfect, would + have + V3.

Elizaveta Gizun

Belarus

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Compléter Lost Opportunities: Conditional IIIVersion en ligne Complete the sentences with the correct forms of the verbs. Use Conditional III: If + Past Perfect, would + have + V3. par Elizaveta Gizun 1 If industries ( not / increase ) releasing greenhouse gases , the greenhouse effect ( not / start ) to build up . 2 If humans ( not / release ) fewer CFCs into the atmosphere , the ozone layer ( not / become ) depleted . 3 If humans ( not / cut down ) so many trees for fuel , they ( not / release ) so much pollution into the air . 4 If humans ( not / cut down ) so many trees , the forests ( absorb ) more carbon dioxide by now . 5 If rain and snow ( not / start ) mixing with acids , the problem of acid rain ( not / appear ) . 6 Humans ( not / make ) such a great impact on the environment if they ( not / produce ) such an amount of greenhouse gases . 7 If the world ( invest ) more in renewable energy earlier , we ( avoid ) many environmental problems . 8 If governments ( sign ) the Kyoto Protocol earlier , the emissions ( reduce ) significantly . 9 If people ( know ) about climate change in the 19th century , they ( take ) action sooner . 10 If factories ( use ) cleaner technologies , the air ( become ) much less polluted .