If you happen to live in fear of asteroids, then here's a sobering fact for you: Our planet absorbs asteroid impacts like a truck grille eats bugs.

如果你在为小行星会不会撞击地球而忧心忡忡，那么你应当清楚这样一个事实：由于地球引力而引发的小行星撞击，就好比飞驰的卡车，车头前面的格栅总是在不断吞噬着迎面扑来的飞虫。

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Fossil fuel burning and fertiliser manufacture now take more nitrogen from the atmosphere than all of the planet's nitrogen-fixing microbes - and there are a lot of those bugs out there.

BBC: Leaving our mark: Fossils of the future