Global Warming Name: Liang Wei Major: Electric Machinery and Electric Equipment Main Content • • • • The earth is warming The cause of global warming The consequence of global warming Action The earth is warming What is global warming and how it works? Global Warming: Global warming is the increase in the average temperature of the earth’s near-surface air and oceans in recent decades and its protected continuation. Proofs of Global Warming • the accelerating melt of polar ice, glaciers (冰 河)and snow. This is the most obvious evidence of global warming. • Rising sea level The warmer temperatures have raised sea level by expanding ocean water, melting mountain glaciers. Globally, sea level has risen approximately 15-20 cm over the past century. During the entire 20th century, the average global temperature increased by 0.6 degrees Celsius. Using computer climate models, scientists estimate that global by the year 2100 the average global temperature will increase by 1.4 degrees to 5.8 degrees Celsius. The cause of global warming Global warming is associated with greenhouse effect closely. Greenhouse effect is a natural phenomena .greenhouse effect often gets a bad name because of its association with global warming,but the truth is we couldn’t live without it. What is greenhouse effect? Greenhouse gases especially carbon dioxide in the atmosphere can warm the earth by trapping heat energy. The greenhouse effect is a natural phenomenon，which is important. Without the greenhouse effect, the Earth would not be warm enough for humans to live. Enhanced greenhouse effect When human activities distort and accelerate the natural process by creating more greenhouse gases , the atmospheric concentration of greenhouse gases increases, if there is too much of greenhouse gases in the atmosphere ,the greenhouse effect would become stronger, which is called “enhanced greenhouse effect”. And with greenhouse effect being enhanced, the earth would be warmer than usual. Carbob dioxide are the biggest problem contribution to global warming by greenhouse gases from human activities 8% 6% 16% 50% 20% Carbon Dioxide CFCs Methane Ozone Nitrouse Oxide Carbon (109 metric tons) Worldwide Carbon Emissions 8 7 6 5 Total Liquid fuel Solid fuel Gas fuel 4 3 2 1 0 1750 1800 1850 1900 Year 1950 2000 If emission of carbon dioxide continue to grow at current rate ,then the level of the gas in the atmosphere will likely double,or possibly triple,from preindustrial levels during the 21st century. 2. How do humans contribute to the effect of global warming？ Burning natural gas, coal, and oil Deforestation Many factories produce longlasting industrial gases Population growth Burning fossil fuel Burning fossil fuels releases the carbon dioxide stored millions of years ago. Most of the increased carbon dioxide comes from fossil fuels Carbon Dioxide (CO2) Fossil fuels (coal, oil, natural gas) Deforestation Deforestation releases the carbon stored in trees. Less trees also means less carbon dioxide can be removed from the atmosphere Industries emissions Many factories produce long-lasting industrial gases that do not occur naturally, yet contribute Significantly to the enhanced greenhouse effect And global warming that is currently under way. Population Growth Population growth is another factor in global warming, because as more people use fossil fuels for heat, transportation and manufacturing the level of greenhouse gases continues to increase. As more farming occurs to feed millions of new people, more greenhouse gases enter the atmosphere. 3. Impact of global warming. • Glacier thaw and rising sea level • More frequent happens of natural disasters • Affecting human beings Glacier thaw Argentina Wildlife Effects • Polar Bears Require pack ice to live Might eventually go extinct in the wild • Sea turtles Breed on the same islands as their birth Could go extinct on some islands as beaches are flooded • Other species may go extinct as rainfall patterns change throughout the world Effect on Humans • Global warming is a danger to a human's health. Its affect on climate can adversely affect humans. • Plagues have been attributed to global warming. An increase in temperature can result in a longer life cycle for diseases. • Global warming can affect our future ability to obtain food. As climates change, plants and animals will change, leading to a change in the eating patterns of humans. Wildlife Effects • Polar Bears Require pack ice to live Might eventually go extinct in the wild • Sea turtles Breed on the same islands as their birth Could go extinct on some islands as beaches are flooded • Other species may go extinct as rainfall patterns change throughout the world So cute Polar Bears , however, the greenhouse effect will be ... ... They tremble with fear to guard their home ... ... Effects on sea level---Higher sea level Global warming may make the sea level become higher. Warmer weather makes glaciers melt. Some melting glaciers add more water to the ocean. Warmer temperatures also make water expand. When water expands in the ocean, it takes up more space and the level of the sea rises. A 2℃ increase in earth's average temperature is expected to raise the sea level by about 50 cm. Sea level is rising more rapidly , and will probably continue to rise for several centuries. More frequent happens of natural disasters Frequent natural disasters such as: tropical storms, hurricanes,drou ght,floot. Effect on human beings • Some disease would become more widespread. • Global warming will seriously affect agriculture. So romantic penuins, but the greenhouse effect will make them ... ... action Global warming is a global problem requiring action from the entire international community. Countries from around the world are working together to share technologies, experiences, resources and talent to lower net greenhouse gas emissions and reduce the threat of global climate change. International effort Common responsible 责任共担UNCCC The United Nations Climate Change conference 哥本哈根气候峰会 2009年12月7日—18日 The earth can meet humanity’s needs ,but cannot satisfy humanity’s greedy. Thanks for watching~~!!