[chrisco255]

Methane isn't stable in the atmosphere. It eventually converts to CO2 and H2O (within 10 years of emission). It's also an extremely miniscule portion of the Earth's atmosphere, at 1.7 parts per million. It is a negligible factor in global warming.

EDIT: Methane is .00017% of the Earth's atmosphere. It cannot be a major factor in retaining heat in the Earth's atmosphere, even though it may be 20 times more effective than wator vapor at retaining heat, it exists in such low concentrations that it can't have a significant effect. To be clear, wator vapor is up to 4% of the atmosphere at any time, so it exists in concentrations 20,000 times greater than Methane.

https://earthobservatory.nasa.gov/images/5270/atmospheric-me...

EDIT 2: it doesn't matter how good methane is at retaining heat if it exists in the parts per billion range...it's negligible. It would be equivalent to eating a single additional calorie a day in your 2000 calorie diet. It would not cause you to gain weight. Equivalently, if you exercise 1.8 more seconds a day than you usually do, you're not going to gain more muscle or burn more fat.

EDIT 3: https://cdiac.ess-dive.lbl.gov/trends/atm_meth/ice_core_meth... ice cores showing variable methane rates over the last 800K years, a time in which we've swing in and out of ice ages several times over.

Also, humans killed off megafauna much larger than cows and taking up much more biomass towards the end of the Paleolithic era, in a time when the climate was rapidly warming. Despite plunging populations of megafauna and their supposedly toxic digestive systems, the climate continued to warm by 8 degrees around 12000 years BP, well before we discovered fossil fuels. https://royalsocietypublishing.org/doi/full/10.1098/rspb.201...

[mercutio2]

This is not how climate balance works.

There used to be a relatively stable equilibrium in the climate. There have always, and will always, be many mechanisms contributing to the overall total radiative forcing.

We can’t reduce how much water vapor is in the atmosphere very easily. But methane, we can.

It doesn’t matter that methane has low partial pressure. What matters is the total radiative forcing, and every molecule of uncombusted methane has a very high radiative forcing in the atmosphere.

[chrisco255]

It doesn't matter if it has a strong effect at the molecular level if it exists in miniscule quantities 4 orders of magnitude less than water vapor while not trapping any part of the light spectrum that is not already captured by H2O and CO2. It has negligible, near zero effect at present. Sorry, if you factor the 20x factor for methane heat retention times .00017 it's the equivalent of increasing the amount of water vapor from 4% to 4.004% of the Earth's atmosphere. It is negligible no matter which way you look at it. If a .004% difference in humidity made a dramatic effect on heat retention you'd feel it.

[algorias]

Well, here's an analogy: If you have $1000 salary and $900 of fixed expenses (+ $100 of disposable income), then a reduction of just 10% in your salary reduces your disposable income by 100%. A reduction of 20% in your salary puts you deep into the red and will eventually make you homeless.

Climate is like your budget. There's a lot of factors flowing into it, and even a very small change (e.g. 0.1% additional water vapor) can flip the sign on the total balance. Sorry, but your argument about the magnitude of the problem is just wrong.

[chrisco255]

That's a bad analogy because the climate is not a single variable, number one. Two, your percentages are off by orders of magnitude with regards to Methane. Methane, as I said above, is 0.00017% of the earth's atmosphere. Even if it is 20 times more effective at retaining heat than Water Vapor (4% of earth's atmosphere), it's the equivalent of increasing your fixed expenses by .004%, or 4 cents by your $1000 example. 4 cents is negligible. No accountant would even bother listing it.