Environmental groups were divided over the nation's first carbon tax ballot measure.
About two thirds of the gas produced by a study area near Barrow, Alaska, came from increasingly abundant greenery covering only 5% of the landscape, researchers estimate.
Preliminary results from field measurements of smoldering Kalimantan peatlands suggest that the fires emitted 8% less carbon dioxide and 55% less methane than were previously estimated from lab tests.
In one of the first studies to investigate large lakes as methane sources, researchers found that Lake Erie is releasing more of the potent greenhouse gas than expected.
A probe of ballast water in ships at an Arctic port finds hitchhiking organisms that polar warming could allow to invade the region's ecosystems in less than 40 years.