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Farming is being threatened by environmental changes - and agriculture itself is sometimes part of the problem, with trees being cut down to make way for cash crops, and methane-producing animals being turned into protein for human consumption. Finnish scientists have come up with a new solution. They have produced a protein from "thin air" - soil bacteria fed on hydrogen split from water by electricity - which they say will compete with soya on price within the decade. Writer and environmental campaigner George Monbiot has tried a pancake made from the yellow powder and explains how innovations such as this could tackle global food shortages in the future. Image: Solein powder on a glass plate. Credit: Solar Foods / Mikael Kuitunen