New Scientist: Should we “dope” trees with nitrogen fertiliser to engineer a cooler global climate? New findings suggest the nutrient could be a switch for determining how much solar energy forests in Earth’s cooler regions reflect back out into space. Scott Ollinger of the University of New Hampshire, Durham, and colleagues measured the concentrations of nitrogen in forest canopies in 181 plots across the US, sampling trees that were anywhere from 15 to 500 years old. The team compared this …