science

=SCIENCE PAGE - ESSAY- FOR APRIL 27TH = = = = =  Paragraph 1: Four Steps of the Greenhouse Effect

-Topic Sentence: Global warming is the result of the Greenhouse effect, the process of absorbing and radiating heat. The Greenhouse effect involves four steps.

-Short wavelength, high energy heat from the sun. -Solar radiation passes atmosphere, only small % reaches earth’s surface because gases & particles absorb or energy from going through. - The solar radiation that reaches the earth heats surface & generates terrestial heating during the day *Step 2: Daytime Terrestrial Heating -Influenced by many factors: altitude of sun (greater alt., more heating) color of surface (dark colors absorb more heat, white=absorbs less) -Surface acts as a heat collector -the absorbed heat is retransmitted at night, terrestrial radiation -Earth releases heat back into the atmosphere at night -Long wavelength, low energy -Normal levels of greenhouse gas prevent some of the heat from escaping to space. -concentration of greenhouse gases (methane, carbon dioxide, nitrous oxide, water vapor, CFCs) increased, preventing nighttime terrestrial radiation from escaping during the night. Hence, warming the atmosphere.
 * Step 1: Incoming Solar Radiation
 * Step 3: Nighttime terrestrial heating
 * Step 4: the Greenhouse Gases

Paragraph 2: Evidence that global temp. is increasing Topic Sentence: It is true that global heating is occurring, and there is evidence to support it. -Human generation of CO2 from burning fossil fuel outpaces the earths ability to swallow it up; hasnt had this much CO2 for hundreds of years, -Intergovernmental Panel on Climate Change global temp has gone up 1 degree F. since late 19th century. -Sea levels have gone up 6 inches over the past century -Glaciers have receeded. -If kept up, planet temp could rise another 2-7 degrees -Appears to be unrealted to natural fluctuation of temp

Paragraph 3: Evidence that global warming is not occuring Topic Sentece: However, there is other evidence that global warming is not occuring at all. -Satellite data shows that since 1979, no warming occured, slight cooling -Warming isnt in sync with the rise in greenhouse gases, global surface temp rose between 1915 and 1940, then leveled off before rising again in 1970. warming due to post-war emissions. -Global climate change cannot be measured in labs. Models are wrong.

Paragraph 4: Negative Effects -Crops and human health storm severity, developed and undeveloped countries