Monday, March 7, 2011

Climate Change

Climate Change - The Facts

The vast majority of the scientific community is in consensus that climate change is happening and human activity is almost certainly the cause. In the last 100 years the Earth has warmed by 0.74°C (and by 0.4°C since the 1970s), meaning that global sea levels have gone up, glaciers and sea ice has melted, floods and droughts are on the increase, and heatwaves are worse.
The term 'greenhouse effect' was coined to describe the way some gases in the atmosphere (such as carbon dioxide, nitrous oxide, and methane) trap some of the light energy from the sun after it is reflected from the Earth's surface, and  before it can escape out into space, so warming our atmosphere. This is a natural process that has been happening for billions of years, and without it the Earth would be about 33°C colder – too cold for us to live on. Now, however, human influence has upset the natural balance of carbon dioxide and other greenhouse gases and too much of the sun's energy is being trapped, causing average temperatures to rise. Human greenhouse gas emissions have gone from practically nothing to tens of billions of tons per year since the start of the industrial revolution. At present, over 30 billion tonnes of carbon dioxide (CO2) is emitted globally each year by burning fossil fuels, and another seven billion tonnes by changes of land use, mainly deforestation.
Around the world, climate change would cause greater risks from rising sea levels, flooding, droughts, food shortages, diseases, water shortages and loss of tropical forests.
Southern Europe and the Mediterranean Basin are the most vulnerable regions in Europe, and mountain areas (in particular the Alps), islands, coastal regions and densely populated floodplains are facing serious consequences.
According to the Fourth Assessment Report (AR4) of the Intergovernmental Panel on Climate Change (IPCC) in 2007, we could expect to see continued melting of ice caps, glaciers and sea ice, significant changes in rainfall patterns and possibly more intense tropical cyclones such as hurricanes.
Flooding will contaminate drinking water, expose people to toxic pollutants and make the delivery of health and social services more difficult. Droughts will increase the risk of water shortages. Food and water shortages could lead to conflict and migration.

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