Adam Siegel and Natasha Chart are noting that Markos isn't following the Lieberman-Warner legislation winding its way through the Senate, and wondering why that is. While global warming is a huge issue, it's still an issue. Issues are instruction manuals for what to do with power, not mechanisms for fighting entrenched set of actors who don't want to do what you want them to do.
One key question in politics is coalitions. John Edwards had most 'issues' done correctly in his Presidential race, as did Dennis Kucinich. Yet neither built a coalition to actually wield power, because neither was fundamentally interested in political change. Aside from some small bore work in North Carolina, John Edwards made zero progress on poverty. When he actually had power in the Senate, he was a moderate pro-business Southern Democrat. But when he needed liberal votes, he started waving instruction books around and screaming that his were better. Kucinich is even worse.
People focus on what they are passionate about. If you're interested in science policy or energy stats, it's great that you are researching what needs to happen policy-wise to stave off global collapse. I'm not interested in that so much, though I'm glad you are taking notes and I will hopefully help give you a bit of power to do what needs to happen. I am interested in political power and why Environmental Defense and NRDC are considered anything but corrupt saboteurs, so that your instruction manual gets more play.
But please don't disrespect people who are interested in political power by pretending that everyone has to care about what you care about. Everyone is not you and 'substantive' knowledge about legislation is not necessarily more or less useful than tracking other parts of politics. It's just different.