This article in ScienceDaily and this link describe 'a simple machine' being developed at university that could, if multiplied across the planet, remove billions of tonnes of carbon-dioxide from the atmosphere.
Richard Branson, head of the Virgin Group, has offered a $25 million prize to anyone who can devise a system to remove a billion tonnes of CO2 per year from the atmosphere for at least ten years.
The Calgary device consumes 100kWh for every tonne of carbon-dioxide it removes. The prototype removes 20 tonnes a year. So 50,000 devices of the same capacity would be needed to win the Virgin prize, and would consume 5GWh/year of electricity.


<< Home