Professor Ward recently published the book "Under a Green Sky". He explains his theory of how extinctions happen with no meteorites necessary. It is enough to have trace elements in the atmosphere start a chain reaction that can leave the sky literally green.
Big bubbles of poisonous gases can kill many animals. In fact it already happened in a smaller scale a few years ago in Africa. People were peacefully sleeping in their town when a big bubble of CO2 came out of a lake nearby and all the animals and people died in the town.
As I understand his ideas, Prof. Ward is telling us that the Earth is not as stable as some of us will want it to be. We live in a fragile world, and we know for sure that it is not going to last more than a few billion years more.
It will be wise to heed his advice and treat our Earth with gloves, it can take less beating than most of us might think.
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