Changes in biological activity are an important part of the carbon cycle but are difficult to quantify at the global scale. (ipcc.ch)
The authors of this July paper in Bioscience present some worries, especially as the forests have key roles in many parts of the carbon cycle. (earthtimes.org)
But they're also a key part of the carbon cycle: Although wetlands cover only about 3 percent of Earth's surface, they account for as much as 30 percent of soil carbon storage. (discovermagazine.com)