Guardian: If we were starting afresh, we probably wouldn’t chose to build an energy infrastructure based around fossil fuels. But like it or not, we are stuck with power stations, cars and homes that use carbon-based energy sources. The problem is that almost all these buildings and vehicles last a long time. If they stay in use, we are committed to large-scale future production of greenhouse gases. But how large? A new paper in Science by Dr Steve Davis and colleagues at Carnegie Institution …