What is GlobalWarming?Global warmingis the rise intemperature ofthe Earthsatmosphere.
Global WarmingGlaciers are melting, sea levels are rising,cloud forests are drying, and wildlife isscrambling to keep pace. Its becomingclear that humans have caused most of thepast centurys warming by releasing heat-trapping gases as we power our modernlives. Called greenhouse gases, their levelsare higher now than in the last 650,000years.
The Intergovernmental Panel onClimate ChangeThe IntergovernmentalPanel on Climate Change isa group of scientists of theUnited Nations. This groupmeets every few years toreview the latest scientificfindings and write a reportsummarizing all that isknown about globalwarming.
CausesScientists have spent decadesfiguring out what is causingglobal warming. Theyvelooked at the natural cycles andevents that are known toinfluence climate. But theamount and pattern of warmingthats been measured cant beexplained by these factorsalone. The only way to explainthe pattern is to include theeffect of greenhouse gasesemitted by humans.
Greenhouse gasesGreenhouse gases are made of watervapour, carbon dioxide, methane, nitrousoxide and ozone.The sunlight enters the atmosphere of theEarth and itis reflected back by its surface. Greenhousegases prevent the sun radiation from escapingand trap it in the atmosphere. This is one ofthe biggest causes of global warming.
Greenhouse gasesThere are several gases responsible forwarming, and humans emit them in a variety ofways. Most come from the combustion of fossilfuels in cars, factories and electricity powerplants. The gas responsible for the mostwarming is carbon dioxide. Other contributorsinclude methane released from landfills andagriculture, nitrous oxide from fertilizers andgases used for refrigeration and industrialprocesses, and the loss of forests.
Effects• Ice is meltingworldwide, especially at theEarth’s poles.• Some species will be lead toextinction.• Natural disasters willbecome stronger.• Less fresh water will beavailable.
What can we do?We can increase the amount of gaseswe take out of the atmosphere. Plantsand trees absorb carbon dioxide asthey grow, "sequestering" carbonnaturally.We should avoid to use cars and try tochange to electrical cars.Clean power plants are also the way togo.
ConclusionIn the end, whether you believeclimate change is naturallyoccurring or hastened by mansfootprints, the truth remainsthat there are many ways tocombat climate change, andthey all begin with you. We allmust take responsibility for ouractions and learn to livesustainably, for us, our futureand our world.
Global Warming – “Images”; Global Warming – “Wikipedia”; Global Warming – “Natural Resources DefenseCouncil” News about Global Warming – “ The Telegraph” http://topics.nytimes.com/top/news/science/topics/globalwarming/index.html - “The New YorkTimes – Science (Global Warming)”Search sources: