Methane is a highly effective greenhouse gas.
a. a Suggest some natural processes that contribute to the amount of methane in the atmosphere.
b. b Now suggest some man-made processes that contribute to the amount of methane in the atmosphere.
c. c With reference to methane, why are environmental scientists concerned about possible global warming?
d. d How is methane removed naturally from the atmosphere?
e. e How would an increase in methane concentrations in the atmosphere affect the greenhouse effect?