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1. While natural gas use increases, use of coal as fuel is decreasing.
    随着天然气利用量的增长,煤炭作为燃料的使用量正在减少。

2. The population explosion on our planet has been increasing at an alarming rate but the percentage of increase is decreasing.
    我们星球上的人口爆炸状况正在以惊人的速度加剧着,不过增长的百分比在减小。

3. The production of grain seems to be decreasing mainly because of climate changes.
    粮食产量似乎正在减少,这主要是由于气候的变化。

4. The bird population is decreasing because of oil spills and spreading cities.
    由于海上石油泄漏和城市的不断扩大,鸟类的数量正在减少。