Scientists have found that fossil fuel and biomass combustion, whether from forest fires or from wood-burning stoves, has a larger impact on the climate than previously considered. Black carbon clouds rising from burning organic matter have long been understood to influence the climate by absorbing sunlight and heat. But dark smoke isn't the only climate forcer from these sources, and researchers have found that other biomass emissions, particularly from "brown carbon," have an overlooked impact on the warming planet, according to research published earlier this week in Proceedings of the National Academy of Sciences. Go to story #1