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Global Warming: Plants May Absorb More Carbon Dioxide Than Previously Thought Vocabulary and Expressions take into account p
Global Warming: Plants May Absorb More Carbon Dioxide Than Previously Thought Vocabulary and Expressions take into account p
admin
2018-06-10
36
问题
Global Warming: Plants May Absorb More Carbon Dioxide Than Previously Thought
Vocabulary and Expressions
take into account photosynthesis terrestrial irreversible
thrive carbohydrate biosphere responsive
Global Warming: Plants May Absorb More Carbon Dioxide Than Previously Thought
Global warming may not be damaging the Earth as quickly as feared after scientists found that plants can soak up more carbon dioxide than previously thought.
According to researchers, climate models have failed to take into account that when carbon dioxide increases in the atmosphere, plants thrive, become larger, and are able to absorb more carbon dioxide.
As part of the carbon cycle, plants use light in photosynthesis, turning carbon dioxide into carbohydrate to grow and releasing oxygen as a waste product.
Now a team at Wyoming University has found that carbon dioxide stays in leaves longer than previously thought, acting as a fertilizer and accelerating plant growth.
"The terrestrial biosphere may absorb more carbon dioxide than previously thought," said lead author Professor Ying Sun, of Wyoming University. The scientists say it explains why levels of carbon dioxide in the atmosphere are not rising as quickly as models predict.
The team estimates that climate scientists have underestimated the ability of plants to grow and absorb carbon dioxide by as much as 16 percent.
The finding may mean that it will be easier to fulfill the target of keeping global warming below two degrees since pre-industrial times. The Earth has currently warmed 0. 85 degrees Celsius from 1880.
It was originally thought that vegetation on Earth currently removes one quarter of all human emissions. But the new study suggests it is far higher.
Dr Chris Huntingford, Climate Modeller at the Center for Ecology and Hydrology, said: "This new paper suggests plants are slightly better at capturing carbon dioxide than we thought.
" It will be slightly easier to fulfill the target of keeping global warming below two degrees — but with a big emphasis on ’ slightly’.
" Overall, the cuts in carbon dioxide emissions over the next few decades will still have to be very large if we want to keep warming below 2 degrees. "
In August, a final report by the Intergovernmental Panel on Climate Change (IPCC)found that the world faces "severe, widespread and irreversible" effects of climate change unless it takes urgent action to limit global warming by cutting back on burning fossil fuels.
Extreme weather such as floods, heat waves and droughts are expected to become more common while climate change may even worsen the risk of violent conflicts, the report warned.
The UN has set a target of limiting global warming to 2 degrees Celsius above pre-industrial levels. But the experts said it appears increasingly likely that target will be missed, leading to more severe impacts.
Although the new paper gives new hope that the target could be met. But some climate experts urged caution.
Dr Simon Lewis, Reader in Global Change Science at University College London, said: "This study shows, correctly in my view, that photosynthesis is highly responsive to carbon dioxide, but this is far from the only factor amongst many that will impact the forests of the 21st century and how much carbon they store.
"The level and speed of greenhouse gas emissions cuts needed to avoid dangerous levels of climate change are not altered by this new study. "
Prof Peter Cox, Professor of Climate System Dynamics at the University of Exeter, said: " Avoiding two degrees of global warming is a huge challenge for humanity even if this effect is taken into account. "
选项
答案
It was originally thought that vegetation on Earth currently removes one quarter of all human emissions. But now a team at Wyoming University has found that carbon dioxide stays in leaves longer than previously thought, acting as a fertilizer and accelerating plant growth. When carbon dioxide increases in the atmosphere, plants thrive and become larger, so that plants can soak up more carbon dioxide than previously thought. The finding may mean that it will be easier to fulfill the target of keeping global warming below two degrees since pre-industrial times. Although the finding gives new hope that the target could be met. But some climate experts urged caution. Dr Simon Lewis emphasized that there are much more factors, other than photosynthesis, that will impact the forests of the 21st century and how much carbon they store. And the level and speed of greenhouse gas emissions cuts needed to avoid dangerous levels of climate change are not altered. Prof Peter Cox stressed that avoiding two degrees of global warming is a huge challenge for humanity.
解析
这是一篇有关全球变暖的文章,研究表明植物可以吸收更多的二氧化碳。起初认为地球上的植物能消耗掉人类排放的二氧化碳的1/4,但是怀俄明大学的一项研究表明二氧化碳在植物叶面上实际停留的时间更长,就像肥料促进植物生长。当空气中的二氧化碳增加,植物会更茂盛,进而吸收更多的二氧化碳。这项发现或许表明,人类更容易实现控制全球变暖的目标,但是一些气候专家还是警告大家要小心翼翼。
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