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Billions of tons of carbon dioxide could be captured by rocks and a natural chemical reaction that humans can speed up.


 greenhouse gas rock chemistry climate change carbon dioxide
Fuel cells - a technology that has been around for more than 100 years - convert fuels such as hydrogen and natural gas into electricity through an electrochemical reaction. The resultant heat generated also warms buildings in gas-boiler-sized boxes known as cogeneration fuel cells.


 fuel cell electricity carbon dioxide
Nuclear decay-driven machines could gather gases from the atmosphere of Mars, giving future robotic missions leaps of a kilometre, researchers say. A design concept in Proceedings of the Royal Society A outlines an approach to compress CO2 and liquefy it. The liquid would then be heated much as in a standard rocket, expanding violently into a gas to propel exploratory craft great distances.


 carbon dioxide Mars probe lander robot transport nuclear energy fuel
Irish mathematicians may have solved the mystery of why bubbles in stout beers such as Guinness sink: it may simply be down to the glass. Simulations suggest an upward flow at the glass's centre and a downward flow at its edges in which the liquid carried the bubbles down with it. But the reasons behind this flow pattern remained a mystery...


 beer glass bubble carbon dioxide nitrogen flow