A variety of environmental problems now affect our entire world. As ____ continues, local issues become international ones, so today there are few places in the world that do not suffer from ____ Some of the major problems now affecting the world are acid rain, air pollution , global warming , hazardous waste, ozone depletion ,smog, water pollution, overpopulation, and rainforest destruction. People are also worried about the ____, where an increase in the amount of ____ (CO2 ) and other gases in the Earth’s ____ causes a gradual warming of the surface of the Earth. This global warming is leading to the thawing of the polar ____ and all this is causing concern about ____. Both human behaviour and climate change have led to many animal and plant species becoming ____ or even extinct .

The problems and their causes

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