Global warming is a term used to refer to the phenomenon of the increase in global average temperature of Earth's atmosphere and oceans, since 1850, coinciding with the end of theso-called Little Ice Age,  or either Regarding longer periods. This increase would have increased in the last decades of the twentieth century and the first century.
Global warming isassociated with climate change that may have anthropogenic cause or not. The main effect that causes global warming is the greenhouse effect, a phenomenon that refers to the absorption-by certain atmosphericgases, mainly CO2-energy part of the floor beams, as a result of being heated by solar radiation. The natural greenhouse effect that stabilizes the Earth's climate is not a matter to be included inthe global warming debate. Without this natural greenhouse temperatures would drop by about 30 ° C, with such change, the oceans would freeze and life as we know it would be impossible. To this effectoccurs are required these greenhouse gases, but in appropriate proportions. What worries climate scientists is that an elevation of that ratio will produce an increase in temperature due to heattrapped in the lower atmosphere.
The UN body responsible for the analysis of the relevant scientific data, the IPCC (Inter-Governmental Panel on Climate Change or Intergovernmental Panel on ClimateChange) - argues that "most of the observed increases in average temperature of the globe from half of the twentieth century is very likely due to the observed increase in anthropogenic greenhouse gasconcentrations. " This is known as the anthropogenic theory, and predicts that global warming will continue if they do emissions of greenhouse gases. In the latest report with projections made by IPCCclimate models indicate that it is likely that global surface temperature, increase between 1.1 and 6.4 ° C (2.0 to 11.5 ° F) during the century
Any kind of climate change also involves changes...