Q: 20 (IES/2015)

Consider the following:
1. Solid waste treatment
2. Natural wetlands
3. Ruminant animals
Which of the above can cause methane emissions and thus can contribute to global warming?
question_subject: 
Ecology
question_year: 
2015
question_exam: 
IES
stats: 
0,5624,1544,312,704,528,5624