2016高考英语二轮(阅读理解)精品训练(03)及答案
Against the supposition than forest fires in Alaska, Canada and Siberia warm the climate, scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror more sunlight into space.
This finding suggests that taking steps to prevent northern forest to limit the release of greenhouse gases may warm the climate in northern regions. Usually large fires destroyed forests in these areas over the past decade. Scientists predict that with climate warming, fires may occur more frequently over next several centuries as result of a longer fire season. Sunlight taken in by the earth tends to cause warming, while heat mirrored back into space tends to cause cooling.
This is the first study to analyze all aspects of how northern fires influence climate. Earlier studies by other scientists have suggested that fire in northern regions speed up climate warming because greenhouse gases from burning trees and plants are released into the atmosphere and thus trap heat.
Scientists found that right after the fire, large amounts of greenhouse gases entered the atmosphere and caused warming. Ozone(臭氧)levels increased, and ash from the fire fell on far-off sea ice, darkening the surface and causing more radiation from the sun to be taken in. The following spring, however, the land within the area of the fire was brighter than before the fire, because fewer trees covered the ground. Snow on the ground mirrored more sunlight back into space, leading to cooling.
【2016高考英语二轮(阅读理解)精品训练(03)及答案】相关文章:
★ 重庆市2014高考英语阅读理解一轮(精品)训练题(2)附答案
★ 重庆市2014高考英语阅读理解一轮(精品)训练题(9)附答案
★ 重庆市2014高考英语阅读理解一轮(精品)训练题(14)附答案
★ 重庆市2014高考英语阅读理解一轮(精品)训练题(18)附答案
★ 重庆市2014高考英语阅读理解一轮(精品)训练题(16)附答案
★ 湖南省岳阳市2014高考英语一轮单项选择训练题(8)及答案
★ 重庆市2014高考英语阅读理解一轮(精品)训练题(8)附答案
★ 重庆市2014高考英语阅读理解一轮(精品)训练题(17)附答案
★ 重庆市2014高考英语阅读理解一轮(精品)训练题(20)附答案
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21