Over the years, climate changes have become a very popular issue talked by everyone in the world. The world is obviously getting warmer and warmer. Ice bergs at the North and South Pole are melting and caused the sea water level started to rise. If this situation happened to continue, the impacts to the world is very large and can cause death. This warming of the world, called the global warming, largely is result of emissions of carbon dioxide and other greenhouse gases such as carbon monoxide, methane, nitrous oxide, and others. These gases are mainly result from various human activities like deforestation, burning of fossil fuels for generate energy and transportation and industrial processes.

            In the last twenty years, the global warming issue has been concerned. They believed that the global warming is due to increase of greenhouse gas concentration in the ozone. The continuous emissions of greenhouse gas will result in additional warming over the 21^st century. The global average surface temperature could be anywhere from 1.4 to 5.8°C higher by the end of the 21^st century. Current projections point to a global increase of 1.1°C to 6.4°C by 2100 and U.S expected to be even higher. Such a rapid change in climate would probably cause the rate of species extinction to be increased because the ecosystems could not suitably adapt. Besides, with this warming of global will also came additional sea level rise that will gradually increase the erosion of the beach and flooding from coastal storms, changes in precipitation patterns, increased risk of droughts and floods, threats to biodiversity, and a number of potential challenges for public health. According to a team of health and climate scientists at the World Health Organization and the University of Wisconsin at Madison, global warming has contribute to more than 150,000 deaths and 5 millions illness per year, and those number could double by 2030.