Climate change by prabhunath sharmaPresentation Transcript
Climate change is a broader termthat refers to long-term changes inclimate, including averagetemperature and precipitation.In the atmosphere, “greenhouse”gases trap some of this heat, andthe rest escapes into space. Themore greenhouse gases are in theatmosphere, the more heat getstrapped.
Global warming is the increase of the Earth’s average surface temperature due to a build-up of greenhouse gases in the atmosphere.
GREENHOUSE EFFECT • The “greenhouse effect” is the warming that happens when certain gases in Earth’s atmosphere trap heat. These gases let in light but keep heat from escaping, like the glass walls of a greenhouse. Methane Nitrous oxide Carbon dioxide Sulfur Water hexafluoride
The gas responsible for the most warming is carbon dioxide, alsocalled CO2 . Different greenhouse gases have very different heat-trapping abilities. Some of them can even trap more heat than CO2.A molecule of methane produces more than 20 times the warmingof a molecule of CO2. Nitrous oxide is 300 times more powerfulthan CO2. Other gases, such as chlorofluorocarbons, have heat-trapping potential thousands of times greater than CO2. Butbecause their concentrations are much lower than CO2, none ofthese gases adds as much warmth to the atmosphere as CO2 does.
The planet is warming, from North Pole to South Pole, and everywherein between. Globally, the mercury is already up more than 1 degreeFahrenheit (0.8 degree Celsius), and even more in sensitive PolarRegions. And the effects of rising temperatures aren’t waiting forsome far-flung future. They’re happening right now. Signs areappearing all over, and some of them are surprising. The heat is notonly melting glaciers and sea ice; it’s also shifting precipitationpatterns and setting animals on the move. Sea levels are expected to rise between 7 and 23 inches (18 and 59 centimeters) by the end of the century, and continued melting at the poles could add between 4 and 8 inches (10 to 20 centimeters).
1. Reduce your use of fossil fuels2. Protect native forests as "carbonstorehouses"3. Help plant native trees in urban anddeforested areas
WHAT IS AIR POLLUTION? Air pollution is the introduction of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or cause damage to the natural environment or built environment, into the atmosphere.
1. Environmental Effects 2. Health Effects 3. Acid Rain 4. Loss in Vegetation
Reuse Reduce & RecycleThe only way of Reducing Pollution
1. Absorbs over a ton of harmful greenhouse gases overits lifetime.2. Produces enough oxygen for four people every day(Tree Canada Foundation)3. Provides the equivalent cooling effect of ten room-sizeair conditioners operating 20 hours a day.4. Provides an estimated $273 of environmental benefitsin every year of its life.
• Warming of the climate system is completely clear.• Human-caused warming over last 30 years has likely had a visible influence on many physical and biological systems .• Continued GHG emissions at or above current rates would cause further warming and induce many changes in the global climate system during the 21st century that would very likely be larger than those observed during the 21h century.”