Here is one:
Overview of Greenhouse Gases | Greenhouse Gas (GHG) Emissions | US EPA. Methane is about 1/8th the effect of CO2, just because there's so much CO2.
Thank you for the reference. Let's look at the unit math together, because I want to get it right.
From this reference, annual emissions of methane are 11% of CO2 equivalent. Where CO2 is 81%. This is in metric tons. I presume they are weighing methane with a multiplier of 25 to get that number.
On the methane tab, same site, it says " Methane's lifetime in the atmosphere is much shorter than carbon dioxide (CO2), but CH4 is more efficient at trapping radiation than CO2. Pound for pound, the comparative impact of CH4 on climate change is more than 25 times greater than CO2 over a 100-year period."
But they also say methane lasts 12 years. Why are they normalizing over 100 years to weigh contributions from methane? There might be good reasons to push the effect off the edge of uncertainty and a lot of dynamics that are not even in the model, but it isn't good science.
Let's look at 12 years. If you don't smear over 100 years to come up with a factor of 25, you end up with a factor of 208 times worse than CO2. Or to convert back to the first tab, and methane gets a number of 91 compared to CO2s number of 81. I did not renormalize to get percent, but in one significant figure calculations:
Using a 10 year effect window, The methane emissions from this year will heat the atmosphere 10% more than CO2 emissions from this year.
Looks like we are neglecting what will kill us, if we really want to get the attribution right:
Fracking could prompt a sharp rise in greenhouse gas emissions
Methane emissions in fracking are not well documented. I don't buy the EPA accounting on methane release during fossil fuel production.
Where is the math error? ( I am sure there is one somewhere). For short fuse (<10 year) global warming, annual methane release is worse than CO2, based on what we think is being emitted. And we don't have a good handle on how much methane is actually being emitted.
https://thinkprogress.org/methane-l...ountless-studies-find-8b060b2b395d#.ytmh3wjwm
Tesla does not use methane extensively, do they?