Fossil fuels only part of human carbon emissions; land use, deforestation matter too

Big square baler harvesting wheat straw for production of cellulosic ethanolIn discussions of climate change, much of the focus has been on the combustion of fossil fuels: coal, oil and its gasoline and diesel-fuel derivatives, and natural gas. Collectively, the trillions of tons of carbon dioxide emitted into the atmosphere by man since the start of the industrial revolution around 1750 have contributed to a massive rise...