Global warming is an increase in the Earth's temperature, which causes changes in
climate' A warmer Earth may lead to changes in rainfall patterns, a rise in sea level, and
impacts on plants, wildlife, and humans. Studies indicate that global surface temperature
has increased by about 0.3-0-6"C over the last century. This warming comes from the
increase of greenhouse gases (carbon dioxide and methane) in the Earth,s upper
atmosphere' This effect caused by human burning of fossil fuels, industrial, farming, and
destroying forests.
Average global temperatures may increase about 1.4-5.C by the end of the 21st
century. Many scientists believe an increase in temperatures may lead to changes in
precipitation and weather patterns. warmer ocean water may result in serious storms and
hurricanes' sea levels are also expected to increase by 0.09 - 0.88 m. in the next century. lt
causes from melting glaciers and expanding seawater. Global. warming may also affect
wildlife and human' Human health is also in danger and global warming may result in the
spreading of diseases such as malaria, a risk of heat stroke, and poor air quality.