Climate change temperature effects

Global Warming An increase in the near-surface temperature of the Earth. Global warming has occurred in the distant past as the result of natural influences, but the term is most often used to refer to a theory that warming occurs as a result of increased use of hydrocarbon fuels by man. See Climate Change (Greenhouse Effect). ... 

What will happen under field conditions is, however, highly uncertain. Laboratory experiments have been conducted under conditions of abundant nutrients and water, ideal temperatures, and no competition among experimental plants. Such conditions are rare in the field. The best prediction is that, whereas increases similar to those found in the laboratory are unlikely under field conditions, increased concentrations of CO2 are likely to ameliorate to some extent the detrimental effects of climate change. However, field-scale experiments under a variety of soils and climates and with several crop plants are needed to provide information on effects of climate change accompanied by higher concentrations of CO2 on agricultural productivity. 

Computer models have been developed to predict the effects of the forcing fiuic-tions shown in Figure 25.22 on future climate change and sea level rise under a variety of what-iT scenarios. A recent set of projections based on several likely GHG emission scenarios is presented in Figure 25.23. In 1990, the IPCC presented a first set of projections, estimating that between 1990 and 2005, global average temperatures would... 

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