http://cgi.cse.unsw.edu.au/~lambert/cgi-bin/clim Abstracts on global climate change from WoS 2004-2007 en http://cgi.cse.unsw.edu.au/~lambert/cgi-bin/clim/2006/10/12#160 Global climate change, especially, increases in carbon dioxide (CO2) concentration and the associated increases in temperature will have significant impact on the crop production. Grain-sorghum [Sorghum bicolor (L.) Moench] cultivar DeKalb 28E was grown at daytime maximum/nighttime minimum temperature regimes of 32/22, 36/26, 40/30 and 44/34 degrees C at ambient (350 mu mol CO2 mol(-1)) and elevated (700 mu mol CO2 mol(-1)) CO2 from emergence to maturity in controlled environments to quantify the effects of temperature and CO2 on the reproductive processes and yield. Growth temperatures of 40/30 and 44/34 degrees C inhibited particle emergence. Growth temperatures >= 36/26 degrees C significantly decreased pollen production, pollen viability, seed-set, seed yield and harvest index when compared to 32/22 degrees C. Percentage decreases in pollen viability, seed-set, seed yield and harvest index due to elevated temperature were greater at elevated CO2 when compared with ambient CO2. Elevated CO2 increased seed yield (26%) at 32/22 degrees C, but decreased seed yield (10%) at 36/26 degrees C. At high temperatures, elevated CO2 increased vegetative growth but not seed yield, thus, leading to decreased harvest index. We conclude that the adverse effects of elevated temperature on reproductive processes and yield of grain-sorghum were more severe at elevated CO2 than at ambient CO2; and the beneficial effects of elevated CO2 decreased with increasing temperature. The adverse temperature sensitivity of reproductive processes and yield at elevated CO2 was attributed to higher canopy foliage and seed temperatures. (c) 2006 Elsevier B.V. All rights reserved. http://cgi.cse.unsw.edu.au/~lambert/cgi-bin/clim/2006/10/01#121 The gases (they consist of three or more atoms) with higher heat capacities than those of O-2 and N-2 cause greenhouse effect. Carbon dioxide (CO2) is main greenhouse gas associated with global climate change. Collectively, they are projected to contribute, directly, about as much too potential global warming over the next 60 years as CO2. At the present time, coal is responsible for 30-40% of world CO2 emissions from fossil fuels. There were a higher correlation between amount of carbon dioxide emission and percentage of carbon in the fuel for all equations. The squares of correlation coefficients were 0.9999, 0.9978, and 0.9995.