New Scientist: Solar panels covered the office roof, wind turbines hummed on the hill, and biogas was brewing in the field behind us. Last week Petra Rösch spoke proudly about how her farm in Proschim village, eastern Germany, had become an energy supplier for the area. It was the perfect image of Germany's claims to be the world leader in renewable energy, and a model for how the industrialised world can tackle climate change. There was just one problem. Later this month, Brandenburg's state government looks...