1、Greenhouse Effect Basics,Jinyan Yang,10-25-2010,Translation,1) As a result, the surface is warmed more than it would have been in the absence of these gases, which serve a purpose similar to that of the glass walls of a greenhouse.,2) Tropical deforestatation has also become a significant energy sou
2、rce over the past several decades, which making up about 25% of recent global emissions.,3) However, current anthropogenic sources are estimated to be about twice as large as natural sources and have led to more than a doubling of preindustrial atmospheric CH4 concentrations.,4) Halocarbons comprise
3、 a number of chlorine-, fluorine-, or bromine-containing gases with generally powerful heat-trapping properties.,5) This “low-level” ozone is produced through the oxidation of CH4 as well as through reactions involving a number of precursor gases, which are themselves produced in part by human activ
4、ities like biomass burning and fossil fuel combustion.,Answering Questions,1) What is the greenhouse effect?,2) What causes the greenhouse effect?,3) What does global warming refer to?,4) What are the most important human-generated greenhouse gases?,5) Where is methane released from?,Preparation for Unit 6-Acid Rain Basics,See you next week!,
