1) Global warming ................. by the greenhouse effect. a) causes. b) is caused. c) is causing.  2) The environment ................. by Industrial pollution a) is affected b) has affected c) affects 3) Serious climate changes ........................by global warming. a) is caused b) causing c) are caused 4) Human activity ...................... our climate to change. a) are caused. b) cause c) is causing 5) The effects of climate change ...................... equally across the planet. a) are not felt b) are not feel c) don´t feel

level 4 - passive voice

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