The most dangerous asteroids contain a lot of stone or iron, according to NASA. 1998 QE2 contains a good bit of carbon and well as amino acids, the building blocks of protein.

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They say the case for limiting carbon emissions is every bit as strong as it was for lead, or for ozone-depleting chemicals, or other substances that have been regulated by the EPA over the last three decades.

NPR: Supreme Court Hears Global Warming Arguments

Producing plausible policies and ways for the public to have a say on them will be hard harder, perhaps, than the practical problem of coming up with ways to suck up a bit of carbon or reduce incoming sunshine.

ECONOMIST: Geoengineering

That is the second bit of the carbon market.

ECONOMIST: Selling hot air

All that's needed, apparently, is an energy source, some sort of carbon-based material and a bit of water.

FORBES: We've Got Company

Meanwhile, these lamps combined will equal to carbon emissions of all the motor vehicles in the UK. This can be a bit depressing, but there is some good news.

FORBES: How to Light Africa Within a Decade

Current techniques aren't exactly cheap, but researchers from Stanford University think they've made a bit of a breakthrough by producing a relatively inexpensive photovoltaic cell using nothing but carbon.

ENGADGET: Stanford researchers create 'world's first' all-carbon solar cell, do it on the cheap

If five-star hotels are a bit too mainstream for you, perhaps you should check out China's first carbon neutral hotel instead.

BBC: The sharpest rooms in Shanghai

The Carbon Fair in Cologne, organised by the World Bank, is the annual get-together of the second bit of the market.

ECONOMIST: Selling hot air