The elevated CO2 could change the global carbon balance, it is essential to study the response of vegetation to the elevated CO2 concentration.

CO2排放量的增加将改变全球生态系统碳平衡。植物对CO2浓度增加的响应是个重要研究课题。

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The results indicated the number of bacteria decreased significantly (p < 0.05) under elevated CO2 for Pinus sylvestriformis and Pinus koraiensis.

结果表明，长白赤松和红松土壤细菌数量受高浓度CO2影响显著（p < 0.05）减少；

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The effects of global warming, elevated CO2, increased UV-B radiation and N deposition on litter decomposition was reviewed in this paper based on literatures.

就全球环境变化如全球变暖、大气CO2浓度升高、UV-B辐射增强、氮沉降等对凋落物分解影响的研究进展进行了综合述评。

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Despite advances in understanding the impacts of elevated CO2 concentrations on a wide range of marine organisms, we are still unable to make meaningful projections of impacts on marine ecosystems and fisheries as a whole, or to identify thresholds beyond which marine ecosystems may not recover.

UNESCO: Social and Human Sciences

The "high end" of IPCC projections would imply a rise in global temperatures in the upper portion of its projected range of between 1.4 and 5.8C between 1990 and the end of this century, though the exact figure depends on how climatic systems respond to elevated CO2 as well as on how society responds.

BBC: NEWS | Science/Nature | Carbon emissions show sharp rise