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  3. Forests give us shade, quiet and one of the harder challenges in the fight against climate change. Even as we humans count on fo

Forests give us shade, quiet and one of the harder challenges in the fight against climate change. Even as we humans count on fo

admin2021-01-06  74
问题    Forests give us shade, quiet and one of the harder challenges in the fight against climate change. Even as we humans count on forests to soak up a good share of the carbon dioxide we produce, we are threatening their abilities to do so. The climate change we are hastening could one day leave us with forests that emit more carbon than they absorb.
   Thankfully, there is a way out of this trap—but it involves striking a subtle balance. Helping forests flourish as valuable "carbon sinks" long into the future may require reducing their capacity to absorb carbon now. California is leading the way, as it does on so many climate efforts, in figuring out the details.
   The state’s proposed Forest Carbon Plan aims to double efforts to thin out young trees and clear brush in parts of the forest. This temporarily lowers carbon-carrying capacity. But the remaining trees draw a greater share of the available moisture, so they grow and thrive, restoring the forest’s capacity to pull carbon from the air. Healthy trees are also better able to fend off insects. The landscape is rendered less easily burnable. Even in the event of a fire, fewer trees are consumed.
   The need for such planning is increasingly urgent. Already, since 2010, drought and insects have killed over 100 million trees in California, most of them in 2016 alone, and wildfires have burned hundreds of thousands of acres.
   California plans to treat 35, 000 acres of forest a year by 2020, and 60, 000 by 2030—financed from the proceeds of the state’s emissions-permit auctions. That’s only a small share of the total acreage that could benefit, about half a million acres in all, so it will be vital to prioritize areas at greatest risk of fire or drought.
   The strategy also aims to ensure that carbon in woody material removed from the forests is locked away in the form of solid lumber or burned as biofuel in vehicles that would otherwise run on fossil fuels. New research on transportation biofuels is already under way.
   State governments are well accustomed to managing forests, but traditionally they’ve focused on wildlife, watersheds and opportunities for recreation. Only recently have they come to see the vital part forests will have to play in storing carbon. California’s plan, which is expected to be finalized by the governor next year, should serve as a model.
By saying "one of the harder challenges ", the author implies that______.
选项 A、global climate change may get out of control
B、people may misunderstand global warming
C、extreme weather conditions may arise
D、forests may become a potential threat
答案D
解析 根据题干关键信息“one of the harder challenges”定位到原文第一段。原文第一段第一句“Forests give us shade，quiet and one of the harder challenges in the fight against climate change．”引出文章话题——在人类对抗气候变化中，森林给我们带来了一个更为艰巨的挑战。第二句提到人类正威胁着森林吸收二氧化碳的能力，第三句紧接着提到人类所造成的气候变化问题最终会使得森林排放更多的二氧化碳，而不是吸收，换言之，森林可能会威胁到气候和人类生存。故选D。
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