According to researchers, there is a 90 percent probability that by 2100 the minimum temperatures in the tropics and sub-tropical regions will be higher than the maximums so far recorded in those areas.
The effect on crop-growing in those regions would be dire, according to the projections based on direct observations and data culled from 23 computer models on the planet's evolving climate patterns.
"The stresses on global food production from temperature alone are going to be huge, and that doesn't take into account water supplies stressed by the higher temperatures," said David Battisti, a University of Washington atmospheric sciences professor.
In the tropics, the warmest temperatures will cut maize and rice harvests by 20 to 40 percent, the researchers said.
The hotter weather will also reduce the moisture in the soil, cutting yields even further.( 文章閱讀網(wǎng)：www.sanwen.net )
Some three billion people, or half the world's population, currently live in tropical and sub-tropical regions, and their number is set to double by the end of the century.
These regions stretch from northern India, southern China to much of Australia and all of Africa, and also extend from the southern United States to northern Argentina and southern Brazil.
星期四，一項(xiàng)新的研究警告稱，由于氣候變化，世界上一半的人口將在本世紀(jì)末面臨食物短缺的問(wèn)題。
根據(jù)調(diào)查，有百分之90的概率，在熱帶和亞熱帶地區(qū)的最低溫度2100將高于這些地區(qū)迄今為止有記錄的值。
對(duì)這些地區(qū)的作物生長(zhǎng)的影響將是可怕的，據(jù)預(yù)測(cè)，基于直接觀察和數(shù)據(jù)從23個(gè)計(jì)算機(jī)模型在氣候變化中。
“氣溫本身對(duì)于全球糧食生產(chǎn)的影響將十分巨大，這還沒(méi)有考慮到高溫所導(dǎo)致的水供應(yīng)的壓力，”戴維說(shuō)，巴提斯蒂，華盛頓大學(xué)大氣科學(xué)教授。
在熱帶地區(qū)，最熱的溫度將減少百分之40到20的玉米和水稻的收成，研究人員說(shuō)。
炎熱的天氣也會(huì)減少土壤中的水分，進(jìn)而進(jìn)一步減少產(chǎn)量。（文章閱讀網(wǎng)：www.sanwen.net）
大約有三十億人，或者說(shuō)世界上一半的人口，目前生活在熱帶和亞熱帶地區(qū)，而且他們的數(shù)量將在本世紀(jì)末加倍。
這些地區(qū)從印度北部、華南到澳大利亞的大部分地區(qū)和非洲大陸，也從南部的阿根廷到巴西北部和南部。
