What Is Global Warming? • Global warming is the warming of the earth through carbon dioxide (CO2) being pumped into the atmosphere from tailpipes and smokestacks. Then the gases trap heat like the glass in a greenhouse. This is where the term the “greenhouse effect” came from.
If amount of solar energy absorbed by the earth is equal to the amount radiated back into space, the earth remains at a constant temperatureSun Solar Radiative Energy Cooling
However, if the amount of solar energy is greater than the amount radiated, then the earth heats up.Sun Solar Radiative Cooling Energy
If the amount of solar energy is less than the amount radiated, then the earth cools down.SunSolar RadiativeEnergy Cooling
What’s HappeningScientists say that the barrier insulating the continental ice caps is melting. “The impacts of warming temperatures in Antarctica are likely to occur first in the northern sections of the continent, where summer temperatures approach the melting point of water, 32 degrees F (0 degrees C).”
• As the ice melts, big chunks of glaciers will break off and become like ice cubes in a big glass of water. The ice chunks, known as icebergs, create mass in the ocean. The icebergs displace the water causing the ocean level to rise. Some of the shoreline in many places like Florida (where the land is at a low altitude) will go under water.
To a certain degree, the earth acts like a greenhouse. Energy from the Sun penetrates the glass of a greenhouse andSun warms the air and objects within the greenhouse. The same glass slows the heat from escaping, resulting in much higher temperatures within the greenhouse than outside it.
Sun A dramatic example of the Greenhouse effect can be seen with the planet Venus. Venus’s atmosphere consists of 97%carbon dioxide and 3% nitrogen. In addition, the surface is covered by dense clouds of water and sulfuric acid. Thecombination of greenhouse gases Venusresults in a surface temperatureof 860 F – even hotter than theplanet Mercury, which is nearest the Sun.
How Long Has It Been Going On • The reason the temperature has risen so much in the past 150 years is because of how much more we have used fossil fuels, which gives off carbon dioxide. According to NOAA (National Oceanic and Atmospheric Administration), the global warming rate in the last 25 years has risen to 3.6 degrees F per century, which tends to confirm the predictions of temperature increases made by
The frequency of heavy precipitation events has increased over most land areas - Rainfall in Mumbai (India), 2005: 1 million people lost their homes
Heat waves have become more frequent over mostland areas- Heat wave in Europe, 2003: 35 000 deaths
Intense tropical cyclone activity has increasedin the North Atlantic since about 1970- Hurricane Katrina, 2005: up to $200 billion cost estimate
ore intense and longer droughts have been observeder wider areas since the 1970s, particularly in theopics and subtropics
What Will Happen• Rising global temperatures are expected to raise sea level, and change precipitation and other local climate conditions. Changing regional climate could alter forests, crop yields, and water supplies. It could also affect human health, animals, and many types of ecosystems. Deserts may expand into existing rangelands, and features of some of our national parks may be permanently altered.
Kyoto Protocol• In an effort to reduce carbon emissions, the Kyoto protocol• was adopted in 1997. • It proposed to cut CO2 emissions by 5% from 1990 levels for period of 2008-2012 • However, such minor cuts would be symbolic only, since such cuts would not significantly impact
What’s Happening to the Animals• Penguin population decline. Adelie penguin populations have shrunk by 33 percent during the past 25 years in response to declines in their winter sea ice habitat.
• Some species of wildlife could be greatly affected by global warming • For example, polar bears • require pack ice in order to hunt and live. • If all pack ice disappears, they might eventually go extinct in the wild. • Sea turtles • breed on the same islands as they are born on. • They could go extinct on some islands as beaches are flooded before new beaches are produced. • Other species may go extinct as rainfall patterns change throughout the world.
Effect on Humans• Global warming will affect peoples throughout the world. For example, – Fewer deaths will result from cold weather, but more deaths will result from heat waves – Initially, decreased thermo hyaline circulation will result in – cooler temperatures in North Atlantic. – The CO2 fertilization effect will increase crop yields by up to 30% – Precipitation changes will result in • droughts and famine in some areas and • expanded arable land in Canada, Soviet Union Free Powerpoint Templates Page 19
Mitigation of Global Warming Methods of mitigating global warming include Conservation • Reduce energy needs, such as electrical usage, petroleum usage, reduced packaging • Recycling, which uses less energy to produce products compared to Another way to reduce carbon emissions is to use alternate energy sources, such as • Nuclear • Wind • Geothermal • Hydroelectric • Solar • Fusion
Solutions Sintetic trees that will apsorbe CO2 from air and reduce it into oxygen
Making sulphurwrapping around theEarth by launching rockets filled with sulphur.
To make big umbrella into the space withmillion small aircrafts to protect the Earth from warming
Conclusion• Global warming is affecting plants, animals, humans and the earth. We need to learn how to conserve our use of fossil fuels to minimize carbon dioxide production. This will slow down the effects of global warming.