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地球是我们唯一赖以生存的家园，我们一定要注意保护环境，才能继续安全宁静地生活。
近期，法国的研究人们员对地球未来的环境状况有着不甚理想的预计和预测。
French researchers are predicting doom for Planet Earth.
They believe neighboring planets could stray out of orbit and collide with the Earth billions of years from now. The BBC's David Shukman explains their theory.
A view of Earth from orbit and a strange question "how long would it last?" Scientists have long known about the violent event that formed solar system. But now they study the movements of our nearest neighbors. Mars, they reckon, could drift uncomfortably close or do this. If we are really unlucky, it can actually collide with us. Literally, the end of the world.
"So what exactly is this research saying? Well,one key thing that the orbits of the planets which look steady aren’t all that regular. Over the years, some start to move pretty wildly.These are the projected tracks. And the odds are that will lead to a very big collision in about threebillion years’time."
With that long to go, the researcher involved doesn’t look too worried. But amid the old instruments of the observatory in Paris where he works, he has a doom-laden message about the future and what a collision would eventually mean.