..and forest fires, deforestation, land use, methane from rubbish dumps, methane from permafrost and a thousand other things.
Still adding a large carbon tax directly at the source gives us pretty much the best bang-for-the-buck. It would have to be combined with deforestation taxes too otherwise you'll see countries like Brazil go into overdrive to export "green fuel".
Methane is a powerful short term GHG, but long term only the CO2 left by decayed methane is relevant. Forest fires etc are completely temporary, contemporary trees are not geologically sequestered.
Still adding a large carbon tax directly at the source gives us pretty much the best bang-for-the-buck. It would have to be combined with deforestation taxes too otherwise you'll see countries like Brazil go into overdrive to export "green fuel".