【正确答案】Global warming is one of the most pressing environmental issues today. Cars and factories release a large number of greenhouse gases into the atmosphere each year, which, like a blanket, block the earth's heat from escaping and make our atmosphere warmer and warmer.The rising temperature would shift global rainfall patterns, bringing drought to some now-fertile areas and flooding some low-lying areas; the rising temperature would melt the polar ice caps, resulting in the rising of sea levels. If we don't take some positive action right now, we will suffer severe consequences.