Global greening’ sounds good. In the long run, it’s terrible
Carl Zimmer writes: “Global greening” sounds lovely, doesn’t it? Plants need carbon dioxide to grow, and we are now emitting 40 billion tons of it into the atmosphere each year. A number of small studies have suggested that humans actually are contributing to an increase in photosynthesis across the globe. Elliott Campbell, an environmental scientist at the University of California, Santa Cruz, and his colleagues last year published a study that put a number to it. Their conclusion: plants are…