【#小学英语# 导语】周记是一个汉语词汇,拼音为zhōu jì,基本意思是用文字记载一个星期以来自己的学习、生活情况或身边发生的事、令你感动的人、一件小物品、一处优美的景色等,如同日记。以下是®文档大全网整理的《小学生英语周记范文六篇》相关资料,希望帮助到您。
There are a number of possible solutions to the problem, but none of them is easy. Firstly, governments could discourage people from having large families. Why not have just one child?
Secondly, farming methods in those countries are very simple and often inefficient. If the people bought new agricultural machinery, modernized their farming methods and developed more land, they might soon produce enough food for their needs.
Thirdly, many countries have natural resources such as oil, wood or iron. These could be exported so that food could be imported.
All of these possible solutions simplify the problem. But they show that, if people mean to solve the problems of increasing population and food shortages, there are ways of doing it.
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.
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.
This is my classroom , it is very nice. I like my classroom very much . Do you have a nice classroom, too ?
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