Question

we need to look for alternative source of energy justify the answer scientifically​

Answer 1

Explanation:

alternative sources of energy are necessary because : the mainstream fossil fuels like coal and petroleum are non renewable so their reserves are ending fast. the burning of fossil fuels is polluting the environment . the CO2 obtained from burning fossil fuels is leading to green house effect leading to global warming

Answer 2

it is mixture of methane and carbon dioxide hydrogen hydrogen sulfide by is produced in anaerobic degradation like animal waste plant waste in the presence of water digestion of the oxygen do not pass and it take time.