A German company tries funneling CO2 emissions underground:

Scientists working in the town of Ketzin, just outside of Berlin, want to begin pumping quantities of the greenhouse gas underground this week in order to determine whether it can be stored safely in sandstone deposits during a test phase that will continue through 2009.

Immediate problems: this takes 20 percent more energy than releasing it into the air; it may seep out later; the technology is very new. But it's a start. Some kind of carbon capture may well be part of the climate change solution.

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