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Is the Long-Term Elevated Air CO2 Environment Beneficial for Plants, Crops and Vegetation?

SUMMARY Rising atmospheric carbon dioxide concentration and air temperature are of major concern when considering the possible effects of global climate change on crops and vegetation and their magnitudes. Although production has been found to increase in many cases, other experiments have also indicated increased hazards for plant growth because of the increased frequency of weather extremes, such as droughts, floods, and extreme temperatures. Thus at the same time, elevated CO2 can be foreseen as an indirect constrain and as a stress alleviator. In the shorter term, the effect of CO2 is direct and is mediated by the photosynthesis.