What are global warming issues ?

Global Warming is a gradual increase in temperatures across the whole of planet earth. Both natural events and human activities on the earth are contributing to this change. This fact is now very well documented and accepted by scientists as true: the earth is the currently the hottest is has been for over 400 years- and it may be that it hasn’t been so hot in the last 2000 years or so. Measurements indicate that the average global surface temperature has increased by around 0.3-0.6 degrees centigrade over the last hundred years, the largest increase in surface temperature over the last 1,000 years and scientists are predicting that this increase will speed up over the next hundred years. The global warming is ascribed to the increase of greenhouse gases (mainly carbon dioxide and methane) in the earth’s upper atmosphere. This buildup of gases is chiefly caused by humans burning fossil fuels, by industry, farming and deforestation. Average global temperature may increase by around 1.4 to 5.8 degrees centigrade by the end of the 21st century, and though these number sound small they are actually smaller than the temperature differences between an ice age and ice-free age. The rise in temperatures will initiate significant changes in climate-not only more hot days but changes in rainfall patterns and weather systems. Climate change is probably already having an impact on the earth’s systems. In the future the problems that will be the effect of rising sea level and increasing spread of deserts and droughts are also likely to affect the developing countries more than rich countries.