According to the Advanced English Dictionary, Global Warming is basically the gradual increase in the temperature of the earth’s atmosphere believed to be due to the greenhouse effect caused by increased changes in climate.
Greenhouse effect is described by Wikipedia English as a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases and is re-radiated in all directions.
Since part of this re-radiation is back towards the surface and the lower atmosphere, it results in an elevation of the average surface temperature above what it would be in the absence of the gases.
In the recent past, scientists across the world have spent decade figuring out what is the real cause of global warming.They’ve gone beyond looking at the natural cycles and events that are known to influence climate.But so far, the amount and pattern of warming that’s been measured can’t be explained by these given factors alone.
However the only way to explain the pattern is to include the effect of greenhouse gases (GHGs) emitted by humans.
To bring all this information together, the United Nations established a group of competent scientists called the Intergovernmental Panel on Climate Change (IPCC).
The IPCC meets every few years in a bid to review the latest scientific findings and write a report summarizing all that is known about global warming.Each report represents a consensus or agreement, among hundreds leading scientists.
One of the first things scientists learned in their respective discoveries is that there are several greenhouse gases responsible for warming and humans emit them in a variety of ways.Most come from the combustion of fossil fuels in cars, factories and electricity production.
The gas responsible for the most warming is carbon dioxide, also known as carbon oxide.Other contributors include methane released from landfills and agriculture (especially from the digestion systems of grazing animals, nitrous oxide from fertilizers, gases used for refrigeration and industrial processes and the loss of forests that would otherwise store carbon oxide).
Since 1990, yearly emissions have sky-rocked by about 6 billion metric tons of “carbon dioxide equivalent” worldwide, more than a 20 per cent increase.Last month, the United Nations Conference on Sustainable
Development (UNCSD) organized in pursuance of General Assembly Resolution 64/236.
The conference was held in Brazil on 20-22 June 2012 and marked the 20th anniversary of the 1992 United Nations Conference on Environment and Development (UNCED), in Rio de Janeiro, and the 2002 World Summit and Sustainable Development (WSSD) in Johannesburg.
It was envisaged as a Conference at the highest possible level, including Heads of State and Government or other representatives.The conference under the Rio +20 umbrella, tacked among many other issues global warming where climate change was noted to be expected to hit developing countries the highest with its
effects being higher temperatures, changes in precipitation patterns rising sea levels and more frequent weather-related disasters which pose risks for agriculture, food and water supplies.
At stake, global warming has been attributed to the recent gains in the fight against poverty, hunger and disease and the lives and livelihoods of billions of people in developing countries.