Could a CO2 sucker save the planet?

Perhaps we no longer need to worry about global warming and that Bush was right all along - US technological expertise will "step up to the plate" and save the planet.

As always, things are not so simple. I could list the "economic flaws" but I am sure they are all too apparent.

I suppose the question as a non-scientist is once the CO2 has been sucked out of the air where does it go? Secondly, how many of these machines would be needed to suck all of the US' yearly emissions, how much land would be needed and how much energy would be employed to make the machine in the first place. I suspect it just won't add up.

Machine to clean up greenhouse gas is breakthrough in war on global warming, say scientists [Mail online]

Scientists say they have invented a machine that can suck carbon dioxide out of the air – potentially creating a vital weapon in the war against global warming.

The blueprint for the CO2 'scrubber' raises the prospect of a generation of machines which would help reduce the billions of tonnes of greenhouse gases being pumped into the atmosphere by the use of fossil fuels.

The team of US scientists now plans to build a prototype which would capture one tonne of CO2 from the air every day.

Though the idea is considered a holy grail in the battle against climate change – and Sir Richard Branson has put up £12.6 million for anyone who makes it a reality – the machines would fall far short of a quick fix.

The prototype, being built at a laboratory in Tucson, Arizona, by a company called Global Research Technologies, will cost about £100,000 and take about two years to construct.

The devices – each nearly the size of a shipping container - would have to be produced in their millions to soak up human carbon emissions.

The idea is bound to be controversial, with environmentalists seeing so-called technological solutions to global warming as undermining attempts to promote greener lifestyles and industries.

But physicist Klaus Lackner, who led the U.S. team behind the invention, said the CO2 scrubber offered more hope than current efforts to cut carbon emissions by reducing fossil fuel use.

' I'd rather have a technology that allows us to use fossil fuels without destroying the planet, because people are going to use them anyway,' he said.

Scientists say it is not difficult to remove carbon dioxide from the atmosphere by absorbing it in various chemical filters. But the problem has been how to clean those filters of CO2 so they can then be reused to carry on the job.

Professor Lackner, of New York's Columbia University, says the solution lies in a newly discovered property of absorbent plastic sheets known as 'ion exchange membranes' which are routinely used to purify water.

It turns out that humid air can make these membranes 'exhale' the CO2 they have trapped – leaving them clean and ready to absorb another load.

The Lackner team says the captured carbon dioxide could then be pumped into greenhouses to boost plant growth.

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