A history of mass extinctions on Earth

During long history of planet Earth, massive extinctions and violent climate changes are the norm. We've created this infographic to help you chart the rise and fall and rise of life on Earth over the past few billion years.

Humans may have evolved during an unusual period of relative climate stability (despite those ice ages). What you see here are the biggest mass extinctions in Earth history and their places in the major geological ages of Earth. We've also got body counts - the line graph in the middle shows you how many species survived, which in some cases is nearly zero.

It's hard to decide whether this is a pessimistic chart or an optimistic one. Life always manages to find a way, even when there is a serious destruction of the planet.

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Scenes from the Gulf of Mexico

Based on recently revised estimates, BP's ruptured oil well at the bottom of the Gulf of Mexico continues to leak 25,000 to 30,000 barrels of oil a day. The new figures suggest that an amount of oil equivalent to the Exxon Valdez disaster could still be flowing into the Gulf of Mexico every 8 to 10 days. Despite apparent efforts to restrict journalists from accessing affected areas, stories, video and photographs continue to emerge. Collected here are recent photographs of oil-affected wildlife, people and shorelines around the Gulf of Mexico on this, the 51st day after the initial explosion.

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