Before this goes too far, I feel the need to point out a number of problematic assertions with the OP (and the links cited there and in the following posts).
Yes, methane is far more effective at trapping heat than carbon dioxide (a whopping 84 times as effective, according to the EDF). But what's ignored in the articles is that methane dissipates MUCH faster than carbon dioxide. Whereas methane takes roughly a decade of exposure to Earth's atmosphere before it disappears, CO2 will take thousands of years before it dissipates (all according to EPA estimates). Much of this is due to the fact that methane breaks down quickly in Earth's (and other planets') atmosphere, whereas essentially the only way on Earth that CO2 can be removed from the atmosphere is by plants. As a result of this, the effect of methane on global warming is only 28% that of CO2. Which is still significant, but by no means the "true" or "main" cause of global warming.
Additionally, methane is not going ignored. The UN released a (now skeptically viewed) report in 2006 claiming that methane from cows was doing greater damage to the environment than CO2, which prompted much of the researched I mentioned above. A good deal of climate study in the late 2000s was devoted to how much methane was affecting global warming; might be worth a look.













