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极地冰盖正在融化?关于环境影响的问题

极地冰帽正在以显著的速度融化，部分原因是反照率效应，释放温室气体甲烷到地球大气中。与此同时，我们正在砍伐森林以扩大农业生产。2030年是极地冰灭绝的准确预测吗?

a .)有没有一个模型可以显示我们的森林吸收了多少温室气体?

b .)大量的二氧化碳和甲烷气体会使地球的森林和海洋的自然能力吸收这些气体并开始杀死它们吗?

c .)我们海洋中的浮游生物是否起到了循环大气二氧化碳温室气体的作用?

BBC文章$CO_2$

回答

虽然你的问题并不理想，因为它是3个独立的问题，而且没有太多迹象表明你做了任何研究，但我还是会回答。20 - 30年是极地冰灭绝的准确预测吗?没有人知道它是否准确。根据目前的下降速度和持续变暖，这当然是一个合理的估计。然而，准确预测这样的事情是不可能的。但通过仔细研究，他们通常可以做出相当不错的估计。而且，我不认为这是冰的灭绝，因为冰每年冬天都会回来，只是一个无冰的夏天。还是很糟糕吗?是的。如果可以的话，我们应该防止夏季北极无冰。 > A.) Is there a model to show just how much our forests absorbs green > house gases? This is also a very difficult question. Forests absorb CO2 but they also release it when plants and animals die and/or get eaten. [NASA estimates up to 30% of our CO2][1] is currently absorbed by all the forests in the world, but the article describes the difficulty in reaching that estimate. Similar estimate [from this article][2]. The problem, of-course, is we can't exactly double or triple the amounts of forests we have in the world. We don't have that much free space. Maintaining forests and planting trees can help with climate change but it's unlikely to ever be a fix. > Will an abundance of CO2 & methane-gas over load the earths forests & > oceans natural ability absorb such gases and start to kill them off. No. Methane is too scarce to have much effect and CO2 is, if anything, good for plants, not bad for them. Some studies suggest increased levels in CO2 increase plant growth. There are other related problems. Flooding, hurricanes, droughts, salt from storm surges can hurt, not help plant growth. While the CO2 increase can be a boost to plants, environmental changes can hurt. CO2 isn't a pollutant and it doesn't kill planets at high levels. Greenhouses, for example often store 3 or 4 times the normal CO2 concentration without any harm to the plants. > C.) Does our ocean's plankton act as a mechanism to recycle the atmospheres CO2 Green house gases. Not as well as forests. Plankton does absorb a lot of carbon by photosynthesis but most [gets returned back into the atmosphere][3]. > Although a small but possibly significant percentage of the sinking > organic material becomes buried in the ocean sediment, most of the > dissolved carbon dioxide is eventually returned to the surface via > ocean currents - but this can take centuries or millennia. It's also unclear how much longer the oceans will continue to absorb carbon or if they will [start to release it as they warm up][4]. It's better to ask one question at a time, not three or four, and also, do research before you ask. [1]: https://www.nasa.gov/jpl/nasa-finds-good-news-on-forests-and-carbon-dioxide [2]: https://phys.org/news/2013-06-carbon-world-forests-absorb.html [3]: https://www.gdrc.org/oceans/fsheet-02.html [4]: https://www.newscientist.com/article/dn20413-warmer-oceans-release-co2-faster-than-thought/

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