英语环境课堂PPT.ppt

Unit 2Climate Change Made by group 112Climate Change•Definition•Mechanism•The results of climate change•What we should do3Climate Change•Definition•Mechanism•The results of climate change•What we should do4 The most general definition of climate change is a change in the statistical properties of the climate system when considered over long periods of time, regardless of cause. Accordingly, fluctuations over periods shorter than a few decades, such as El Niño, do not represent climate change.Definition5 The term sometimes is used to refer specifically to climate change caused by human activity, as opposed to changes in climate that may have resulted as part of Earth's natural processes. In this latter sense, used especially in the context of environmental policy, the term climate change today is synonymous with anthropogenic global warming. Definition6Climate Change•Definition•Mechanism•The results of climate change•What we should do7 Climate changes are in response to changes in the global energy balance. On the broadest scale, the rate at which energy is received from the sun and the rate at which it is lost to space determine the equilibrium temperature and climate of Earth. Mechanism8 Climate Change9Climate Change•Definition•Mechanism•The results of climate change•What we should do10 Results11 Results12 The geographic distribution of surface warming during the 21st century calculated by the HadCM3 （（abbreviation abbreviation for for Hadley Hadley Centre Centre Coupled Coupled Model, Model, version version 3)3) climate model if a business as usual scenario is assumed for economic growth and greenhouse gas emissions. In this figure, the globally averaged warming corresponds to 3.0 °C (5.4 °F). Results13 Climate change brought lots of damages. For example, an increase in global temperature will cause sea levels to rise and will change the amount and pattern of precipitation(降水),a probable expansion of subtropical deserts. Results14 ResultsFloodDesertification15Climate Change•Definition•Mechanism•The results of climate change•What we should do16 1.A 1.A redesign redesign of of the the infrastructure infrastructure for for producing producing food, food, energy, energy, water water and and other other commodities commodities so so that that it it is is powered by renewable sources.powered by renewable sources.2.An 2.An overhaul overhaul of of education education systems systems to to develop develop ecological ecological literacy literacy and and encourage encourage creative, creative, real-word real-word problem solving.problem solving.3.Reform 3.Reform our our political political systems systems from from the the current current corporate corporate plutocracies plutocracies to to true true democracies democracies with with real real leaders.leaders.What we should do 17 The beautiful future18The end Thanks19。