I'm concerned with those methane leaks beneath Sibir.
1 kg of methane per 100 years has 23 times stronger greenhouse effect than same amount of CO2.

If plants have used efficiently solar energy to sustain life, couldn't we use vast masses of
methane(primarily product of anaerobic digestion) for energy and thus slow down the
global warming effect?

If you burn metahne, you get CO2, a
less dangerous greenhouse gas.