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或多或少地会使用如果全球气温上升?

我认为地球的大部分土地是不可用太冷和太热没有足够的水和干哪些可以固定不同水这些地区。

然后是海平面上升,因此一些土地将水下但这将是一个新的可用的土地的数量相比显得微不足道,更不用说我们可以重塑土地在这些地区,以防止它被水下。

回答

是的。当前气候变化很可能会增加地球上可耕种的土地。然而,它将在一个较高的社会成本和生物多样性* *的* *,我不能强调足够的至关重要的生物多样性对生态系统的健康和人类食品安全。考虑也类似于矿业,存款的价值不仅是相关矿物的总量,还其浓度,我们也不得不考虑如何强化食品生产所允许的一块土地。在这方面,气候变化可能导致的损失高生产力的领域,只有获得补偿的大片的营养价值在苔原土壤。您还应该考虑当前种植土地的退化的社会影响和经济损失的粮食生产pole-wards移动。与某种程度的确定性回答这个问题是非常复杂的,因为我们不知道如何气候会改变,但是一些研究已经解决了这个问题。就是一个很好的例子(可耕种的土地的全球分销:当前的模式和可能的气候变化的敏感性)[1]。他们指出:我们估计,气候变化,全球气候模拟的>模型,将扩大耕地适宜性的一个额外的16%,主要在北半球高纬度地区>。然而,热带地区>(主要是非洲,南美洲北部,墨西哥和中美洲和>大洋洲)将经历一个小的适用性下降>气候变化。 Figure 4 of the paper shows the current "land suitability index" worldwide. [![enter image description here][2]][2] You can see how the north of America and Eurasia show large expanses (although quite exaggerated by the map projection) of land not suitable for cultivation due to the cold temperatures. This data can be downloaded [here][3], and I've used it to plot the following figure that shows the mean cultivation suitability index as a function of latitude. It is also plotted the land area as a function of latitude as derived from [ETOPO][4]: [![enter image description here][5]][5] As you can see, pole-wards of 56° there is a significant amount of land of which none is suitable for cultivation. However, it is clear that temperature is not the whole picture, and aridity around 25° of latitude can significantly drop cultivation suitability. I found interesting to see that the left (equator-wards) side of the main peak in cultivation suitability currently at 37° lies at a latitude with a lot of land, so if that end is lost to aridity, the gain of land on its (right) pole-wards end will be smaller due to the downwards trends of land area towards the pole. Nevertheless, as I mentioned, models suggest climate change will increase the overall land surface suitable for agriculture. Another study: [Northward shift of the agricultural climate zone under 21st-century global climate change][6]. Focus on temperature and shows in Fig. 1 how the line that divides temperature regime suitable from cultivation of cereals will migrate northwards under the projected climate change: [![enter image description here][7]][7] However, they highlight the challenges for cultivation in high latitudes, which present a much more dramatic seasonal contrast that traditional crop lands: > By 2099, roughly 76% of the boreal region might reach > crop feasible conditions, compared to the current 32%. The leading > edge of the feasible conditions will shift northwards. **However, most of the > newly gained areas are associated with highly seasonal and monthly > variations in climatic water balances**, a critical component of any > future land-use and management decisions. [the cite above was edited for simplification and context] [1]: https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1466-822x.2002.00294.x [2]: https://i.stack.imgur.com/YmMgb.png [3]: https://nelson.wisc.edu/sage/data-and-models/atlas/maps.php?datasetid=19&includerelatedlinks=1&dataset=19 [4]: https://www.ngdc.noaa.gov/mgg/global/global.html [5]: https://i.stack.imgur.com/UkDPh.png [6]: https://www.nature.com/articles/s41598-018-26321-8 [7]: https://i.stack.imgur.com/gWVXQ.png

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\ begingroup美元我只是想添加、气候变化意味着干燥机干燥和潮湿湿所以即使可以种植粮食作物经常会失败。in2018我们有一个非常干燥的夏天在整个欧洲北部斯堪的纳维亚半岛,重创我们不得不放下很多牲畜因为缺乏食物过冬。 \ endgroup美元
- - - - - -trond汉森
2019年1月31日21:07
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\ begingroup美元澳大利亚现在几乎每年都有这个问题。 \ endgroup美元
- - - - - -trond汉森
2019年1月31日在21:09
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\ begingroup美元底线是:我们会失去良好的土地获得更多的贫穷。同时,注意这个北方的土地实际上是缺乏基础设施很有用/居住,即使温度提高 \ endgroup美元
- - - - - -琼
2019年3月7日,在福音14:15

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