Global warming is caused mainly by thick layer of greenhouse gases.
Burning too much fossil fuels leads to thickenig the layer,
and this results in the rise in global temperatures.
Among greenhouse gases, carbon dioxide is considered the biggiest contributors to global warming.
Also, power plants, steel factories, heatings for houses and vehicles make a lot of carbon dioxide.
Now I'm going to talk about some problems resulting from global warming.
First, the severe drought we experienced last year could be a good example.
There were abnormal drought, flood and drastic climate changes like heat wave and cold wave.
Second is the sea level rise.
The polar ice caps keep melting as the earth heats up, which cause rising of seawater.
This could be a serious threaten to low-lying countries such as Tuvalu.
Third, the global waring disturbs the balance of ecosystem.
Animal and plant life have been threatened by habitat loss causing the biodiversity reduction.
January 2017
赶紧投票吧！ 