There are indeed multiple sources of emissions, many not at all needing human intervention at all.
Luckily, we can generally measure natural emissions vs human emissions and find how much of it is being caused by us. Incidentally, due to where various gasses are trapped, many natural looking emissions are still our fault, this is frequently discussed in talks and papers about runaway climate change (note that I mean talks and papers from scientific authorities, not Facebook and fox)
Luckily, we can generally measure natural emissions vs human emissions and find how much of it is being caused by us. Incidentally, due to where various gasses are trapped, many natural looking emissions are still our fault, this is frequently discussed in talks and papers about runaway climate change (note that I mean talks and papers from scientific authorities, not Facebook and fox)