Cooling planet Earth, a solution to global warming?

To cope with the problem of global warming, a new generation of scientists has arise. Instead of trying to stop the enlargement of the hole in the ozone layer by changing our behaviour like it has been argued until now, they propose four colossal solutions to this problem. They first project is to build a huge spatial sunshade to protect the Earth from the sun rays. The second one is to inject millions of tons of sulphur in the atmosphere to cool it. Then they propose to build an articifial ice-floe that would be formed during Winter and which by melting in Spring would cool down the oceans. And eventually, they last idea is to spill iron sulfate in the oceans which would lead to the development of algas that could absorb the gas carbon present in the water. Those projects are now regarded as completly immoderate. But who knows if the evolution of this major problem won’t lead us to live in a science-fiction world???

You can also find more detailed information about this in the "Science & Vie" of this month (December 2006)