I think global warming is a serious threat to our envirioment. There are seveal reasons to suppot my opinion. The global surface temperatures are likely to increase by 1.1 to 6.4 °C (2.0 to 11.5 °F) between 1990 and 2100. And the most serious effect is that more polar ice will be melted. First,some islands or cities will be sinking. There are less land to live for people. Moreover, the animals which live in polar will be extinct. Second, because the global warming will cause the temperature of sea rising, the typhoon will be more frequent. It means a lot of disasters will happen and cause big threat for people. Third, global warming will cause deficiency of water, because the rate of evaporation will great increase. However, water is the most important souce to cultivate, produce and live. Therefore, it will bring big catastrophes to humanity. In conclusion, global warming is a big problem to people. We should take care and protect our globe.
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