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Global Warming http://video.nationalgeographic.com/video/player/environment/index.htmlScriptFor 2.5 million years, the Earth climate has fluctuated, cycling from Ice Ages towarmer periods but in the last century the planet’s temperature has risenunusually fast: about 1.2 to 1.4 degrees Fahrenheit. Scientists believe it’shuman activity that’s driving the temperatures up, a process known as globalwarming. Ever since the Industrial Revolution began, factories, power plantsand eventually cars have burnt fossil fuels such as oil and coal, releasinghuge amounts of carbon dioxide and other gases into the atmosphere.These greenhouse gases trap heat near the Earth through a naturally occurringprocess called the Greenhouse Effect. The Greenhouse Effect begins with the sun and the energy itradiates to the Earth. The Earth and the atmosphere absorb some of thisenergy while the rest is radiated back into space. Naturally occurring gases inthe atmosphere trap some of this energy and reflect it back, warming theEarth. Scientists now believe that the greenhouse effect has been intensified bythe extra greenhouse gases that humans have released. Evidence for global warming includes a recent string of very warm years.Scientists report that 1998 was the warmest year in measured history with2005 coming in second. Meanwhile, radiance taken from ice core show thatthe greenhouse gases carbon dioxide and methane have hit their highest levelsin the past 420.000 years. Artic Sea ice is also shrinking. According to NASA studies, the extentof Artic Sea ice has declined about ten per cent in the last 30 years. As long as industrialised nations consume energy and developingcountries increase their fossil fuel consumption, the concentration ofgreenhouse gases in the atmosphere will continue to rise. Researches predictthat temperatures will increase about 2 to 10 degrees Fahrenheit by theend of the century, what’s lesser in its wet rising temperatures mean for theplanet. Some climate models predict subtle changes. Others forecast rising sealevels which could flood coastal areas around the world. Weather patternscould change, making hurricanes more frequent, severe droughts couldbecome more common in warm areas and species unable to adapt to thechanging conditions would face extinction.Although much remains to be learnt about global warming, many organizationsadvocate cutting greenhouse gases emissions to reduce the impact of globalwarming. Consumers can help by saving energy around the house:switching to compact or rescent light bulbs and driving fewer miles inthe car each week. These simple changes may help keep the Earth cooler inthe future.‘rescent light bulbs’: fluorescent light bulbshttp://video.nationalgeographic.com/video/player/environment/index.html
NA1 The EnvironmentGlobal Warming – National GeographicA. Match the words with the definitionsFluctuate a. a division of animals or plantsFossil fuels b. to changeRelease c. substances made from organic remainsShrink d. let freeConsumption e. to get smallerSpecies f. the act of using somethingB. Watch the video about global warming and answer these questions:1.- How much has the temperature risen in the last century?2.- What three things can you mention that have been burning oil and coal?3.- What do they release into the air?4.- What is the first step to the greenhouse effect?5.- What has increased the greenhouse effect according to scientists?6.- Which are the two warmest years mentioned?7.- What is happening to the Artic Sea ice?8.- What are two changes in the climate?--9.- What other two effects from the weather change can you mention?--10.- What can we do at home to help reduce global warming?--
NA1 The Environment KEYGlobal Warming – National GeographicA. Match the words with the definitionsFluctuate b. a. a division of animals or plantsFossil fuels c. b. to changeRelease d. c. substances made from organic remainsShrink e. d. let freeConsumption f. e. to get smallerSpecies a. f. the act of using somethingB. Watch the video about global warming and answer these questions:1.- How much has the temperature risen in the last century? About 1.2 to 1.4 degrees Fahrenheit2.- What three things can you mention that have been burning oil and coal?Factories, power plants and cars3.- What do they release into the air?Carbon dioxide and other gases4.- What is the first step to the greenhouse effect?It begins with the sun and the energy it radiates to the Earth5.- What has increased the greenhouse effect according to scientists? The extra greenhouse gases the human have released6.- Which are the two warmest years mentioned?1998 and 20057.- What is happening to the Artic Sea ice?It is shrinking. It has declined about 10% in the last 30 years.8.- What are two changes in the climate?- Severe droughts become more common in warm areas- More frequent hurricanes9.- What other two effects from the weather change can you mention?- Rising sea levels which could flood coastal areas around the world -Species unable to adapt to the changing conditions would face extinction10.- What can we do at home to help reduce global warming?
a) Switch to compact or rescent light bulbs b)Driving fewer miles in the car eachweek