[pfdietz]

One could also release the chlorine into the atmosphere to destroy atmospheric methane. Elemental chlorine in sunlight is rapidly (within minutes) broken down into chlorine atoms. These atoms, being free radicals, efficiently extract hydrogen from methane molecules, starting a chain of reactions that converts the remaining fragment to CO2 and water.

You'd need a hell of a lot of chlorine to compensate for current methane injection, though.

[arbitrandomuser]

No , cholrine radicals will also deplete ozone layer , Besides I don't think releasing highly reactive gases at any concentration into the atmosphere is a good idea, there can be other effects we haven't studied well enough.

[pfdietz]

They wouldn't make it to the ozone layer, if released in sunlight.

[pmontra]

If you could release it close to methane concentrations. Otherwise it's going to react with anything close to it. Soil, lungs, vegetation, etc.

[pfdietz]

Methane is present throughout the troposphere -- it has an atmospheric lifetime of something over a decade and becomes well mixed. You'd want to release the chlorine in a sufficiently dilute and dispersed form that it didn't overwhelm the methane in the air it which it was released.