In the past hundred years, there (be) frequent natural disasters, such floods, droughts, mud-rock flows, seismic sea waves, earthquakes, windstorms and the stretching of new deserts. The disasters have killed millions of people, (destroy) countless homes and wiped out numerous pieces of fertile land.
Now more and more people become aware that those disasters have much to do with the damage we have done to the earth. We have cut too many trees in the forests. We have badly (pollution) the environment. We have shocked our own home-planet time and again with (power) explosions of nuclear bombs. As result, climates have become abnormal. Rainwater rushes down hillsides (angry), and the underground energy goes up to revenge itself on us.
The earth is our only home-planet. It is urgent for us to stop damaging it, and to do our best (protect) it and make it a lovely place suitable to live in, for we have nowhere to go and survive except where we are now.
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