Nature: Methane emissions from rice paddies may have been previously overestimated, according to a new study. The concentration of atmospheric methane — a major greenhouse gas — has nearly tripled since the industrial revolution, but the contribution from individual sources has remained unclear. Now Xiaoyuan Yan of the Chinese Academy of Sciences and his colleagues have generated a global map of methane emissions from rice paddies for the year 2000, using country-specific estimates of rice …