In latest 20 years, China's land vegetation continues to increase in purely absorbing the CO₂ and the capacity of photosynthesis averages to increase 1% per year. The latest issue of "Sciences" published the researching achievement of Beijing University in the ecological environment sphere in China. It says that China's forest ecological effect turns to be the goodness. This is the first time for Chinese scientists to publish their achievement in such magazine. American people think the achievement urged the study of relation between global change and terrestrial ecology...