求一篇关于"全球变暖意义"的英文文章?

求一篇关于"全球变暖意义"的英文文章?
求一篇关于"全球变暖意义"的英文文章?

求一篇关于"全球变暖意义"的英文文章?
Global climate unexpected turn of events is warm
Earth’s atmosphere is ideally composed for life,with just the right mix of elements to sustain and support plants and animals.This mix includes small traces of greenhouse gases such as carbon dioxide,methane and nitrous oxide.Because they are composed of molecules of three atoms or more – C02,CH4,NO2-- they thicken up the atmosphere and help trap incoming sunlight after it has bounced off the Earth in the form of heat.Without them,the Earth would be a frozen iceball with temperatures hovering around 0 deg.Fahrenheit.
Greenhouse gases are a good thing,but we’ve all heard about the problems of too much of a good thing and that is clearly the case with greenhouse gases.Human activities are making massive changes in global atmospheric chemistry.Since the dawn of the industrial revolution 250 years ago,carbon dioxide has increased in the atmosphere by 31%,methane by 151% and nitrous oxide by 17%.And we have made new chemicals such as chlorofluorocarbons that are powerful greenhouse gases,not to mention ozone depleters.Around three quarters of greenhouse gases came from burning fossil fuels - coal,oil and natural gas.Most of the rest come from land use changes - primarily deforestation of tropical rainforests.
These changes rank on a geological time scale.Antarctic ice cores hold bubbles of air that perfectly reflect the atmosphere at the time the bubbles were captured.An ice core record going back 420,000 years proves conclusively there is far more carbon dioxide in the atmosphere than at any other time in that record,around 370 parts per million compared to a previous high of 300.CO2 levels are rising the fastest in at least 20,000 years.Drillings from ancient corals and other ocean sediments show it is highly likely that we are at a 20 million year high for carbon dioxide.
The ice core also reveals that this past 10,000 years,the entire period of human civilization,has seen the most stable climate in 420,000.By dramatically increasing greenhouse gases,humanity is threatening to radically destabilize the climate in ways we cannot predict.The more we study the past climate,the more it is evident that climate change can come in huge jolts.Instead of envisioning climate change as a line on a graph gradually going up,it might be better to see it as sharp steps,with each step holding jarring potential to disrupt civilization.
We already know the planet has warmed by around 1 deg.F in the past century.Most of the 10 hottest years on record took place in the past decade,while scientific studies indicate that decade was the hottest in 1,000 years.Meanwhile,severe storms have increased in the U.S.,while over the past 20 years more areas of the planet have suffered from drought or flooding.Spring is coming around a week earlier to the Northern hemisphere,while populations of species from butterflies to marine creatures can be observed shifting north as the planet warms.Glaciers are retreating in mountains around the world,including our own in the Northwest,while the Greenland ice pack has started to melt.In the tropical oceans,corals are suffering and dying from warming waters,threatening the rich biodiversity of these “rainforests of the ocean.”
The mounting evidence for global warming caused the world's leading scientific authority on the topic to make its most conclusive statements to date.In 2001,the Intergovernmental Panel on Climate Change stated,“The warming of the last 50 years due to anthropogenic (human-caused) greenhouse gases can be identified.” The panel said temperature could rise by up to 5 degrees Celsius,or 11 degrees Fahrenheit,this century.That would be twice the entire warming after the last ice age 12,000 years ago,and it would take place in 100 years,rather than over thousands,giving the natural world and human civilization little time to adapt.
The American Geophysical Union,the nation's largest earth sciences association,recently stated,“there is no known geologic precedent for the transfer of carbon from the Earth's crust to atmospheric carbon dioxide,in quantities comparable to the burning of fossil fuels,without simultaneous changes in other parts of the carbon cycle and climate system.” Any remaining scientific uncertainty “does not justify inaction in the mitigation of human-induced climate change and/or the adaptation to it.”