Anthropogenic activities that contribute to global climate change, thereby affecting plant growth and survival are carbon dioxide (CO2 ), ozone (O3 ), and temperature. There has been unprecedented increase in atmospheric CO2 concentration (present atmospheric CO2 concentration is 387 ppm), 40% more than the levels before industrial revolution and is expected to increase to 500-900 ppm by the end of the twenty first century. The concentration of O3 in lower troposphere has increased to 20-50% at an average of 38% since preindustrial era. The Intergovernmental Panel on Climate Change (IPCC), forecasts a temperature rise of 2.5 to 10 degrees Fahrenheit over the next century (http://climate.nasa.gov/effects). Plant photosynthetic rates are influenced by these factors which in turn affect subsequent allocation of carbohydrates, cellulose, lignins, tannins pool, which in long term affect CO2 sequestration . Global climate change may directly alter plant fitness, as well as alter the reproductive success of plants and their interactions through impacts on flowering phenology.
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