In the fight against climate change, trees are an ally. They suck in carbon dioxide, reducing the harmful greenhouse gases. But there’s a problem: we’re asking them to work overtime. Trees can’t absorb enough of the carbon dioxide humanity is throwing at them unless we turn every inch of available land into a dense forest, according to Christophe Jospe, chief strategist at Arizona State’s Center for Negative Carbon Emissions. But what if trees – or…