Washington Post: Humans greenhouse gas emissions have caused nothing but trouble for the environment -- this much is obvious. From the public health problems caused by heavy air pollution to the myriad problems associated with climate change, there have never been more reasons to cut down on our carbon emissions. And a new study, published Wednesday in The Lancet, has just given us one more: Higher levels of carbon dioxide in the atmosphere could be causing nutrient deficiencies around the world.
The research...