THE GREENHOUSE EFFECT
Global Climate Change, is directly or indirectly to human activities altering the atmospheric chemical composition modification attributable, we have changed and continue to change the balance of gases in the atmosphere. This is especially noticeable in key greenhouse gases such as CO2, methane (CH4) and nitrous oxide (N2O). These natural gases are less than 1% of the total, but are vital because they act as a “blanket” around the earth. Without this layer the global temperature would be 30 ° C more floor.The problem is that we are doing this “blanket” thicker. This through the burning of coal, oil and natural gas that release large amounts of CO2 into the atmosphere. When we cut down forests and burn wood, we reduce the absorption of CO2 by trees and together we release carbon dioxide content in the wood. Raising cattle and planting rice generates methane, nitrous oxide and other gases invernadero.Según the IPCC (Intergovernmental Panel on Climate Change) endorsed by the UN, the temperature of the earth’s surface has risen by almost 1 ° C from pre-industrial times, and the current rate of emissions, global temperature will rise between 3 and 5 ° C by the end of the XXI Century. This may not seem much, it is equivalent to return to the last Ice Age but in the reverse direction, this climate change is also the fastest in the last 100,000 years, making it very difficult for the world’s ecosystems to adapt.
Of the few agreements reached at the World Climate Summit, the need not to exceed the threshold of + 2 ° C., a figure from which the problem of global warming we would definitely be stressed hands. This according to the IPCC means stabilizing CO2 concentrations in the atmosphere at 350 parts per million, we are currently at 400 ppm. Unfortunately the agreements are only declarations of intent being not effective or binding commitments.
To predict how this will affect the global climate, it is a very difficult task. The temperature increase is uncertain known effects and other effects are added to uncertain.
Among the known know that rising temperatures are melting the Arctic ice, which acts as a natural mirror reflecting the sun’s rays. Without this huge ice mass, solar radiation is absorbed by the sea making up even more temperatures.
Among the effects are uncertain such as changing patterns of rainfall, wind and the flow of ocean currents, which have prevailed for hundreds and thousands of years and which millions of people depend. The sea level is rising and threatening islands and low lying coastal areas. In a world increasingly crowded and under stress, with enough problems in advance, these pressures directly cause more famine and other catastrophes.
The World Health Organization (WHO) puts it well: “Climate change will certainly lead to a significant loss of life along with the extinction of countless species of plants and animals” .The climate change is the set of large and rapid perturbations climate caused by rising global temperatures. This is the most important environmental problem facing humanity. (Source: Ecologists in Action)
“Climate change” is a change attributed directly or indirectly to human activity climate that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods. (Source: United Nations Framework Convention on Climate Change).
The current climate will change in the coming years at a faster rate due to the effect of human activity. We are seeing every day; more extreme weather events, more disasters of all kinds: hurricanes, tsunamis, earthquakes, volcanic eruptions, intense storms, floods, etc.
Scientists have long to alert the world, and governments seem to begin to take an interest, as they see how the economy and how disasters alter increasingly causing human casualties. Every day the media give more coverage to weather. It is certainly a theme of great current interest.
Climate change is a reality that is manifesting more quickly and decisively than it has been provided so far, and the consequences are beginning to suffer all in the form of droughts, floods, etc., especially in developing countries. (Source: cambio-climatico.com)
Climate change is potentially the greatest threat to biodiversity in the coming decades. Although the earliest signals were given on glaciers and coastal ecosystems, forests and wetlands also be severely affected and early.