Huge dust storms blow out over the oceans from dry parts of North Africa and Central Asia.Tons of dust are lifted and left as a thin film over the ocean surface.
Dust from China is carried east and left in the Pacific Ocean. If a treeplanting programme is successful and the dust supply reduced,
the next result may be that less carbon dioxide gets locked away in the ocean.
Andy,
an environmental scientist, has spent the past few years studying dust and says his work shows clearly the complexity of the system. For this reason the need is to focus on cutting carbon dioxide giving off rather than doing anything else.
Robert, an American scientist,
has shown that when native grassland areas are invaded by trees,
carbon is lost from the soil. “We are studying why the soil carbon disappears,
but one theory is that trees do a lot more of their growing above ground compared to grass,
so less carbon goes directly into the soil from trees.” said Robert.
In wet areas of the world,
the gain from trees absorbing carbon dioxide above ground seems to be outweighed by the loss of carbon from the soil below ground.
Countries that plan to fight against global warming by planting trees may have to think again. Solutions to environmental problems are often more complex than they first appear,
【山东省2016届高三外研版英语单元测试Book8 Module1《Deep South》版含解析】相关文章:
★ 【浙江专用】2014届高考英语一轮复习课时作业(三十四)选修7Unit 4《Sharing》
★ 北京市2014高考英语一轮复习 练习手册(40)选修8 Unit 5 Meeting your ancestors(含解析)新人教版
★ 2014年牛津译林版高中英语总复习(第1轮)同步练习 M10《Unit 3 Protecting ourselves》Word版含解析
★ 2017高考四川省广安市英语阅读理解一轮系列训练:24(含解析)
★ 2014年牛津译林版高中英语总复习(第1轮)同步练习 M11《Unit 4 The next step》Word版含解析
★ 2017届高考英语二轮复习大题冲关秘籍语法填空:创新押题(含解析)
★ 山东省济宁市2016年高考英语复习:条件状语从句(含解析)
★ 【北师大版】2014届高考英语一轮复习指导课时作业:Unit 1 B卷 Word版含解析
★ 【人教版】2014届高考英语一轮复习指导考点针对练:必修1 unit3《Travel journal》
★ 2014年牛津译林版高中英语总复习(第1轮)同步练习 M2《Unit 2 Wish you were here》Word版含解析
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21