[nostromo]

Landfills generally burn off their methane, which turns it into carbon dioxide.

So, yes, they’re roughly equivalent. And things decay faster as compost, so you’d actually be increasing climate change by composting all organic waste.

Methane is mostly a problem when it can’t be captured and burned (ex: cow farts, a serious problem in preventing climate change).

Note that I still support composting. I just don’t think it can be argued from a climate change perspective.