redOrbit: In the latter half of the 20th century, the lush vegetation of China’s forests and grasslands was absorbing roughly one third of its greenhouse gas emissions. According to a recent study, however, that rate is declining rapidly. Peking University researchers say that a combination of factors including high rainfall, government programs to replant forests, shifts in crop use and a higher concentration of bamboo biomass have all played a part in absorbing some 28 to 37 percent of …