= environmental pollution, environmental contamination
Growth of population
= (economic) recession
Many businesses have closed down because of the recession.
Exploit new energy/power
exploit oil reserves, water power, solar energy, etc
开发石油资源﹑ 开发水利资源﹑ 利用太阳能.
family planning, birth control
Consisting of people from all walks of life who are interested in family planning, these associations are mass organizations with an extensive social basis.