请翻译一下这两个单词

Food shortages, climate change

Food shortage,Climatic change

Food shortage ..climate change

食品短缺food shortage
Mankind will face the great challenges from the environment pollution, greenhouse effect, food shortage and energy exhaustion in the 21st century. At the same time, many opportunities of development in the microbial physiology are also provided.
21世纪人类所面临的环境污染、温室效应、食品短缺和能源枯竭等问题 ,既对 2 1世纪微生物 (发酵 )生理学提出了严峻的挑战 ,也给微生物 (发酵 )生理学提供了广阔的发展机遇。
“食品短缺”译为未确定词的双语例句：the short of food
Along with people's standard of living improved, people' worry about the short of food gradually changed into the scare of the safety of food.
随着人们生活水平不断提高,人们以往对食品短缺的担忧逐渐变化为如今对食品安全的恐慌。
气候变化有三种翻译方式：climate change；climatic change；climatic changes。
climate change：
A Study on Response of Dominant Plants to Global Climate Change in Maowusu Sandland
毛乌素沙地优势植物对全球气候变化的响应研究
climatic change ：
The Seas