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Global warming is a term used to refer to the phenomenon of the increase in global average temperature of Earth's atmosphere and oceans, possibly reached the level of medieval warming in themid-twentieth century, to exceed it from then.
All data collections representative from ice cores, the growth rings of trees, etc.., Indicate that temperatures were warmer during the Middle Ages, cooled tolow values ​​during the XVII, XVIII and XIX and then heating again quickly. When studying the Holocene (last 11,600 years), the Intergovernmental Panel on Climate Change (IPCC) shows no evidence ofthere being global annual average temperatures warmer than today. If the projections of a warming of about 5 ° C in this century materialize, then the planet will experience an amount of global meanwarming equal to that suffered at the end of the Ice Age wisconsiense (last ice age), according to the IPCC there evidence that the possible future global exchange rate has been matched in the past 50million years by a comparable rise in temperature.
Global warming is associated with climate change may be anthropogenic cause or not. The main effect that causes global warming is the greenhousephenomenon referred to absorption by atmospheric gases, mainly certain H2O, followed by CO2 and O3 from the ground energy emitted as a result of being heated by solar radiation. The natural greenhouseeffect that stabilizes the Earth's climate is not a matter to be included in the debate on global warming. Without this natural greenhouse effect temperatures would drop by about 30 ° C, with such achange, the oceans would freeze and life as we know it would be impossible. For this effect to occur, are needed these greenhouse gases, but in proper proportions. What worries climatologists is that anincrease of that proportion will produce an increase in temperature due to heat trapped in the lower atmosphere.
The IPCC says that "most of the observed increase in the average global temperature...