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Methane is actually odorless, but it is non toxic (see https://en.wikipedia.org/wiki/Methane#Safety ). The main risk is combustion.

Additionally, a potentially bigger risk is if there is a massive methane release event, it could drastically accelerate global warming.

Methane traps up to 100x more heat in the atmosphere than an equivalent amount of CO2 (over a 5 year period) and 72x more heat over a 20 year period