ENVIRONMENT REPORT - Weather and Plant Growth Study
Caty Weaver
Broadcast: July 4, 2003
This is the VOA Special English Environment Report.
Scientists in the United States say plant life has incread on Earth in the past
twenty years. And they say in every area of plant growth the increa is the result of
weather conditions.
Eight scientists from across the United States did the study. The space agency
NASA and the Department of Energy paid for it. The magazine Science published
the findings.
The rearchers spent a year-and-a-half examining weather and satellite
information. The information was recorded from nineteen-eighty-two to nineteen-ninety-nine. This period was one of the warmest on record. Rearchers found that rainfall generally incread during this time. The satellites measured the amount of leaves on plants and the amount of sunlight
taken in. The scientists ud that information to estimate what is called net primary
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production. This is the total amount of carbon stored in land plants.
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The scientists report a six percent increa in stored carbon since nineteen-eighty-
手机浏览器哪个好用>流行女包two. They say gains were high in equatorial areas, especially around the Amazon
River in South America. The report says that area alone had a one percent increa
in net primary production. Ramakrishna Nemani of the University of Montana in Missoula led the study. He
says reduced cloud cover led to the growth in the Amazon area. He says the lack of
clouds permitted more sunlight to get through. More sunlight meant increas in咖啡加奶茶
photosynthesis. That is the process by which plants u energy from sunlight to
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produce the chemicals they need to grow.
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Northern Canada, the north-central United States and northern Europe were cond
彝族图片in incread plant growth. Ramakrishna Nemani says a ri in temperatures helped
plants there.
All together, the report says twenty-five percent of areas of plant life on Earth experienced increas. But, the
scientists also note increas in the number of people on Earth and carbon dioxide levels in the atmosphere. Study scientist Ranga Myneni of Boston University in Massachutts says humans u about half the net primary production on Earth. And, he notes that world population grew by thirty-six percent during the period of time studied.This VOA Special English Environment Report was written by Caty Weaver.
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