CALENTAMIENTO GLOBAL

Global warming is a term used to refer to the phenomenon of the increase in global average temperature of Earth's atmosphere and oceans, which may reach the level of warming of the medieval period in the mid-twentieth century, to top it from the

Global warming is associated with climate change may be anthropogenic or cause. The main effect that causes global warming is the greenhouse effect, a phenomenon referred to absorption by certain atmospheric gases-mainly H2O, followed by CO2 and O3-energy part of the soil emitted as a result of being heated radiation solar.3 the natural greenhouse effect that stabilizes the Earth's climate is not a matter to be included in the debate on global warming. Without this natural greenhouse temperatures would drop by about 30 ° C; with such a change, the oceans could freeze and life as we know it, would be impossible. For this effect to occur, these greenhouse gases are necessary, but in appropriate proportions. What worries climatologists is that a rise in this ratio will produce an increase in temperature due to heat trapped in the lower atmosphere

Several measures have been proposed in order to mitigate climate change, adapt to it or use geoengineering to combat its effects. The most relevant international agreement on global warming has been the Kyoto Protocol, which aims to stabilize the concentration of greenhouse gases to avoid "dangerous anthropogenic interference with the climate system" .6 It was adopted during Framework Convention United Nations Climate Change and promotes a reduction of pollutant emissions, primarily CO2. As of November 2009, 187 states have ratified the protocolo.7 US's largest emitter of greenhouse gases worldwide, 8 it has not ratified the protoco

.The Evidence of warming of the climate system is manifested in the temperature observed on land and in the ocean, widespread melting of snow and ice increases, and increased level sea.10 December 11, 13

Since 1850, that global temperature records exist, the first thirteen years of this century are among the fourteen warmest years being 1998, 2005 and 2010 the warmest. In 2013 the global mean surface temperature was 0.50 ± 0.10 ° C above the average for the 1961-1990 period. 14

The average global air temperature near the Earth's surface rose 0.74 ± 0.18 ° C over the period 1906-2005. The temperature was increased significantly since 1950, and the rate of warming in the last 50 years was almost double that in the whole period of 100 years (0.13 ± 0.03 ° C per decade, versus 0 07 ° C ± 0.02 ° C per decade). The heat island effect is insignificant cities representing only 0002 ° C the heating decade.15 Satellite measurements confirm the heating temperatures set for the lower part of the atmosphere has increased from 0.13 to 0.22 ° C per decade since 1979.16

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