I think the OP conflated two unrelated facts. We know cattle and agriculture produce methane and have a reasonable idea of the amount, but that's only 1/3 of t

I think the OP conflated two unrelated facts. We know cattle and agriculture produce methane and have a reasonable idea of the amount, but that's only 1/3 of the problem. Satellites are being used to identify industrial scale leaks that were previously unknown or more likely unreported. SoCal gas had a storage facility that was leaking methane in quantities that accounted for 1/4 of the state of California's methane emissions. Similarly they've been able to identify the sources of rogue CFC emissions in China.