climate changes are mostly natural variations.
have humans begun to change the climate?.
spatial scale: local, regional, or global.
Greenhouse Effect:.
The Process: not ozone hole.
it is a natural effect. .
short-wave radiation from the sun warms the earth.
little is absorbed by the atmosphere.
the heated earth emits longwave radiation.
but gases in atmosphere absorb longwave radiation therefore the Earth is warmed.
the warming is a natural feature ~ 20C.
but if we add more gases we will cause more warming. .
Carbon dioxide .
is a natural gas. Normal, cyclical nature of the gas. .
El Nino effect strongly influences the CO2 levels. .
increasing levels of CO2 since 1958: 0.5% per year - increase. .
predicted to be 450 PPM by year 2050.
Human contribution .
to CO2 production is due to burning of fossil fuels. .
part of the carbon cycle occurs naturally and is naturally variable. .
however it is not the only or the most powerful greenhouse gas. .
Methane (CH4).
levels are low compared to CO2.
but 3X more effective. .
pre-industrial levels of methane: 650 PPB.
1990: 1650 PPB.
increasing by 1% per year. .
Sources of Methane:.
natural wetlands, rice paddies. .
termites - through the digestion of cellulose - bacteria in gut uses methane. .
animals such as cattle (ruminants) and sheep and goats. .
Nitrous Oxide (N2O).
pre-industrial levels: 285 PPB.
1990: 310 PPB.
increasing at a rate of 0.2 - 0.3% per year. .
Sources:.
burning of fossil fuels. .
increased use of fertilizer use.
atmospheric residence time of 150 years (CO2 - 10 years). .
Chlorofluorocarbons (CFCs.
human manufactured (not naturally occurring) .
manufactured since the 1930s +40s. .
impact upon the ozone layer. .
increase of 4% per year.
Sources:.
refrigeration, air conditioning, propellants, aerosols.
Relative Contribution of the Greenhouse gases.
CFCs 10-15%.
CH4 - 12-20%.
O3 - 8 %.
N2O - 5%.
Total: 40-50%.
CO2: 50-60%.
Environmental Impacts.
green plants and the biosphere (natural and domesticated).
hydrology: Sea-level changes (predicted to rise), ice cap and glacier melting.
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Global Warming The media has been alerting the general public for numerous years on the perception of global warming and the harm it is causing. ... What scientists detect as global warming may really be a natural occurrence in nature. ... The vast majority of people get their information on global warming from the news media. ... Advocates of global warming point to the 1940's and 1950's as the time period that CO2 levels began to trigger global warming (Carlisle). ... Global warming proponents are seemingly oblivious to the fact that global fluctuations in temperature, charac...
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The Effects of Global Warming Global Warming will perhaps be, in theory, one of the greatest threats to test the capabilities of mankind. ... So what is Global Warming? ... Scientists are also certain that global warming will cause sea levels to rise. ... A major concern is how global warming will affect agriculture. ... Global warming may also increase the risk of some infectious diseases, particularly those diseases that only appear in warm areas. ...
The Effects of Global Warming Global Warming will perhaps be, in theory, one of the greatest threats to test the capabilities of mankind. ... So what is Global Warming? ... Scientists are also certain that global warming will cause sea levels to rise. ... A major concern is how global warming will affect agriculture. ... Global warming may also increase the risk of some infectious diseases, particularly those diseases that only appear in warm areas. ...
Global Warming Climate change is a part of the Earth's history. Global warming is a theory that has been associated with a rise in the global average temperature. ... Scientists argue over the global warming theory. ... (Parsons 5) There are many causes behind global warming. ... Global warming is also in part caused by human activity. ...
Global Warming Climate Changes Int"l Global Warming is shorthand for the climate changes that may result from excessive heat being trapped in the Earth's atmosphere by so called green house gases. ... Over more recent years humans have caused many changes to the Earth which is a major cause for global warming. ... Over the past few decades scientist have been reviewing the changing weather patters due to global warming. ... The issue of global warming is realized to be that of all of the states on Earth and is a huge global common situation. ... There is no immediate solution to ...
My Geography Essay on Global Warming Introduction In this essay I will be talking about the causes, effects and solutions of global warming. Global warming is caused when factories and cars burn fossil fuels and let off carbon dioxide into the atmosphere. ... Another threat linked to global warming is the destruction of the ozone layer. ... Causes Two of the main causes for global warming are cars and factories. ... Global Countries work together to try and crack global warming. ...
