Tag: human influences on ecosystems

waste water story

Ques 23 0 Taken 0

sustainable management

Ques 33 0 Taken 0

crop yield improvement

Ques 37 0 Taken 0

food supply

Ques 41 0 Taken 0

acid rain

Ques 62 0 Taken 0

air pollution - effects and control

Ques 65 0 Taken 0

depletion of ozone layer

Ques 68 0 Taken 0

sewage treatment

Ques 71 0 Taken 0

global warming

Ques 73 0 Taken 0

wastewater treatment - need and methods

Ques 81 0 Taken 0