<tt id="6hsgl"><pre id="6hsgl"><pre id="6hsgl"></pre></pre></tt>
          <nav id="6hsgl"><th id="6hsgl"></th></nav>
          国产免费网站看v片元遮挡,一亚洲一区二区中文字幕,波多野结衣一区二区免费视频,天天色综网,久久综合给合久久狠狠狠,男人的天堂av一二三区,午夜福利看片在线观看,亚洲中文字幕在线无码一区二区
             

          Global warming to alter California landscape

          (Agencies)
          Updated: 2007-12-30 11:37

          Related readings:
          2007 a year of weather records in US
          Global warming speeds ice melting
          US experts insist global warming not man-made
          Penguin species threatened warming
          Global warming 'will destroy Amazon'

          "They could be wiped out of California depending on how quickly the change happens," said Cameron Barrows, who studies the effects of climate change for the Center for Conservation Biology in Riverside.

          Farther north, where wet, cold winters are crucial for the water supply of the entire state, warmer temperatures will lead to more rain than snow in the Sierra Nevada and faster melting in the spring.

          Because 35 percent of the state's water supply is stored annually in the Sierra snowpack, changes to that hydrologic system will lead to far-reaching consequences for California and its ever-growing population.

          Some transformations already are apparent, from the Sierra high country to the great valleys that have made California the nation's top agricultural state.

          The snow line is receding, as it is in many other alpine regions around the world. Throughout the 400-mile-long Sierra, trees are under stress, leading scientists to speculate that the mix of flora could change significantly as the climate warms. The death rate of fir and pine trees has accelerated over the past two decades.

          In the central and southern Sierra, the giant sequoias that are among the biggest living things on Earth might be imperiled.

          "I suspect as things get warmer, we'll start seeing sequoias just die on their feet where their foliage turns brown," said Nate Stephenson, a US Geological Survey ecologist who is studying the effects of climate change in the Sierra Nevada. "Even if they don't die of drought stress, just think of the wildfires. If you dry out that vegetation, they're going to be so much more flammable."

          Changes in the mountain snowpack could lead to expensive water disputes between cities and farmers. Without consistent water from rivers draining the melting snow, farmers in the Central and Salinas valleys could lose as much as a quarter of their water supply.

          Any drastic changes to the state's $30 billion agriculture industry would have national implications, since California's fertile valleys provide half the country's fresh fruits, nuts and vegetables, according to the Union of Concerned Scientists' study.

             1 2 3   


          Top World News  
          Today's Top News  
          Most Commented/Read Stories in 48 Hours
          主站蜘蛛池模板: 亚洲国产系列| 国产日韩在线视看高清视频手机 | 亚洲 欧洲 自拍 偷拍 首页| 日韩一区在线中文字幕| 国产成人精品亚洲午夜麻豆| 69精品丰满人妻无码视频a片 | 亚洲国产精品一二三区| 欧美日本免费一区二| 无人去码一码二码三码区| 欧美做受视频播放| 精品无码人妻| 人人爽人人模人人人爽人人爱| 色综合a怡红院怡红院首页| 中文字幕日韩有码一区| 亚洲国产精品一区第二页| 粉嫩在线一区二区三区视频| 成年午夜免费韩国做受视频| 东京热大乱系列无码| 午夜一区欧美二区高清三区| 一二三三免费观看视频| 日韩AV片无码一区二区不卡| 无码综合天天久久综合网| 成人3D动漫一区二区三区| 亚洲一二三四区中文字幕| 国产精品国产三级国快看| 国偷精品无码久久久久蜜桃软件| www久久只有这里有精品| 久久精品无码专区东京热| 日韩一区二区三区精彩视频| 欧美18videosex性欧美tube1080| 国产无遮挡猛进猛出免费| 日本中文一区二区三区亚洲| 九九热精品在线观看| 精品无码黑人又粗又大又长| 狠狠色丁香婷婷综合尤物| 国产精品 无码专区| 精品国产一区二区三区久久女人 | 国产9 9在线 | 免费| 国产美女被遭强高潮免费一视频| 国产亚洲精品资源在线26u| 亚洲色成人一区二区三区人人澡人人妻人人爽人人蜜桃麻豆 |