Why is global warming a problem? High levels of ____ in the atmosphere lead to ____. The oceans and seas are getting warmer and the polar ____ are melting. This causes ____ to rise, which threatens low coastal regions and islands. Furthermore, the weather is becoming more unpredictable, with severe storms and floods, or unexpected ____ and droughts. Another effect of global warming is a rise in the number of ____. Many animals and plants could become extinct if their ____ are changed.

Global warming

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