Are asteroids humanity’s ‘greatest challenge’?

Written by Mariëtte Le Roux

Tunguska event in 1908

Throughout its 4.5-billion-year history, Earth has been repeatedly pummelled by space rocks that have caused anything from an innocuous splash in the ocean to species annihilation.

When the next big impact will be, nobody knows.

But the pressure is on to predict—and intercept—its arrival.

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Three Impossible Greenhouse Gas Outcomes

Written by Alan Siddons

With all the talk about CO2 and global warming today, it’s odd that the heating mechanism to blame for this concern – the Greenhouse Effect – is seldom contemplated or discussed. Rather, it’s taken for granted.

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Image doctoring must be halted

Written by Nature Editorial

Seven years ago, a cover of The Economist showed Barack Obama, head down on a Louisiana beach in front of an oil rig — the picture of lonely despair. The image perfectly encapsulated the news magazine’s story about the massive pollution caused when BP’s Deepwater Horizon platform exploded, and what the president of the United States could possibly hope to do about it. But Obama was not alone when the picture was taken.

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