Planting 20% more trees throughout Europe could not only help climate change, but it could boost rainfall during the summer by nearly 8%
Planting 20 percent more trees throughout Europe would not only help stave off the effects of 气候变化, but it would boost the continent’s rainfall too, 一项新研究表明.
The research points out that changes to land cover – by adding forests – can have a ‘substantial’ impact on the dry conditions that are associated with changing weather patterns, while also changing rainfall patterns by an average of 7.6 percent in the summer.
‘We conclude that land-cover-induced alterations of precipitation should be considered when developing land-management strategies for climate change adaptation and mitigation,’ the authors wrote in the 研究.
Trees store carbon and an increase of this magnitude on the continent could remove a significant portion of the nearly 43 billion tons of carbon dioxide that humans emit annually, 根据 2019 去年11月出版.
‘Forestation-induced precipitation changes appear to be subject to spatial trade-offs due to downwind effects,’ 作者补充说.
‘While we find a local increase in precipitation due to forestation across Europe, forestation might reduce precipitation further downwind in winter. 然而, forestation increases precipitation downwind in summer, probably due to higher moisture supply by forests than by [agricultural land].’
他们继续: ‘Overall, our results highlight that [land-cover changes], such as forestation, can considerably alter precipitation in the mid-latitudes, both locally and further downwind. 因此, the consequences of human land use for water availability should be considered alongside biogeochemical effects and the biogeophysical alteration of temperatures.
Planting 20 percent more trees throughout Europe could help stave off the effects of climate change, 一项新的研究说
Rainfall patterns would also rise by an average of 7.6 percent in the summer
The area that would most benefit is the Mediterranean, as changes to land cover can have a ‘substantial’ impact on dry conditions associated with changing weather patterns
Rainfall might increase because of the way trees interact with cloudy air, though researchers are still not clear of the exact reason
‘As droughts are projected to become more severe with changing climate in Europe, the interplay between [land-cover] and water availability deserves more attention.’
The researchers acknowledge that not every European country can realistically increase its forest land by 20 百分, pointing out some countries are better suited than others.
因此, the researchers looked at the potential according to the Global Reforestation Map and found that 14.4 percent of land surface is suitable for forestation, specifically in the British Isles, western and southern France, 葡萄牙, Italy and Eastern Europe.
The researchers are not yet certain why planting more trees would increase rainfall, but it could be due to the way they interact with cloudy air, 根据 英国广播公司.
One of the study’s co-authors, Ronny Meier from ETH Zurich, said areas like the Mediterranean need an increase in tree population the most.
‘Probably the most threatening climate change signal that we expect in relation to precipitation, is this decrease in summer precipitation that is expected in the southern parts of Europe like the Mediterranean,’ he told BBC News.
‘还有, according to our study, forestation would lead to an increase in precipitation. So the forestation would probably be very beneficial in terms of adapting to the adverse effects of climate change.’
Some of the trees would be planted on agricultural land, which could negatively impact food production
Woodland covers 13 percent of the UK landmass, 和....相比 31 percent in France and 30 percent in Germany
‘As droughts are projected to become more severe with changing climate in Europe, the interplay between [land-cover changes] and water availability deserves more attention,’ researchers wrote
Researchers looked at the Global Reforestation Map and found that 14.4 percent of land surface is realistically suitable for forestation, specifically in the British Isles, western and southern France, 葡萄牙, Italy and Eastern Europe
在五月, 英国 说过 it would boost the number of trees it plants every year until 2035 至 143 million per year to meet climate targets.
That would double the planting of woodland to almost 80 million in the next four years, with the initial focus being on cities and towns.
Woodland covers 13 percent of the UK landmass, 和....相比 31 percent in France and 30 percent in Germany.
在十月 2020, the Trump administration signed an executive order that reiterated its efforts to help the World Economic Forum’s One Trillion Trees Initiative, growing and conserving one trillion trees worldwide by 2030.
The new study is not without its criticism, given that there is an inevitable impact converting some agricultural land into forests.
在 2019, DailyMail.com 已报告 on a separate study that said taking agricultural land and turning them into forests could lead to starvation of the human population, as population numbers continue to rise around the world.
然而, the new study notes that 20 percent is the right figure to impact climate change, while not negatively impacting agricultural land.
‘Foresting 20% of the land surface decreases winter downwind precipitation over northern Europe, exhibits a weak signal in central and eastern Europe and increases precipitation in coastal areas of western and southern Europe,’ the researchers added in the study.
It’s also possible that the increased rainfall could have negative side effects, given that forests are a ‘much rougher surface than agricultural land,’ Meier added to the BBC.
'所以, it induces more turbulence at the land-atmosphere interface, 并且, the forest exerts more drag on to the atmosphere than agricultural land.’
‘We think that this drag, this higher turbulence over the forests is probably the main reasons for the fact that we find more precipitation in regions with more forests.’
Free University of Brussels Belgium professor Wim Thiery said planting trees is not the sole solution to help countries stay under the 2015 Paris Climate Agreement mandate of an increase 1.5 摄氏度, but it can help.
‘But cutting back on our emissions won’t be enough: we will also need to actively remove carbon from the atmosphere should we wish to stay below 1.5C of warming,’ Thiery told the BBC.
‘From that perspective, tree planting emerges as a potential candidate for generating these negative emissions, but planting trees should never be an excuse for not acting on reducing our carbon emissions by all means possible.’
The new study was published in the scientific journal 自然地球科学.
巴黎协定, 第一次登录 2015, 是控制和限制气候变化的国际协议.
希望将全球平均气温升幅控制在2°C以内 (3.6华氏度) ‘并努力将温度升高限制在 1.5°C (2.7°F)’.
分析所有气候科学论文之间发表的论文 (2.7°F) 分析所有气候科学论文之间发表的论文, 分析所有气候科学论文之间发表的论文 25 分析所有气候科学论文之间发表的论文.
在六月 2017, President Trump announced his intention for the US, the second largest producer of greenhouse gases in the world, to withdraw from the agreement.
1) 将全球平均气温上升幅度控制在远低于工业化前水平 2°C 的长期目标
2) 将全球平均气温上升幅度控制在远低于工业化前水平 2°C 的长期目标, 将全球平均气温上升幅度控制在远低于工业化前水平 2°C 的长期目标
3) Goverments agreed on the need for global emissions to peak as soon as possible, 将全球平均气温上升幅度控制在远低于工业化前水平 2°C 的长期目标
4) 将全球平均气温上升幅度控制在远低于工业化前水平 2°C 的长期目标