This is it, folks! The home stretch. It’s time to pay attention, call your members of Congress, and mobilize your networks. Congress is working on what is likely to be its last big shot at climate change policy for a decade or more. If things go well, the legislation will include a clean energy standard (CES) and clean energy tax credits, which together would revolutionize the US electricity system. If things don’t go well, there will be no substantial climate legislation for many years to come.That’s the only question being decided: Will we get a CES and tax credits, or will we get nothing that will tackle fossil fuels this decade? That’s the binary. It’s time to focus.Looking around, it doesn’t seem like clean energy supporters, climate hawks, or the left more broadly really get that. So let’s talk about why this is such an important moment and what’s at stake. The reconciliation bill is likely the last chance for big federal climate legislationThe Democratic approach for a while now has been to proceed along dual tracks. On one track, there’s the bipartisan infrastructure bill, hammered out by a group of just over 20 senators from both parties. On the other track, there’s the budget reconciliation bill, which is meant to contain … everything else in Biden’s agenda. The former needs 60 votes; the latter can pass with 50 Democratic votes.This has always been a fraught and delicate strategy. It could crash and burn in any number of ways. But so far, at least, it is hanging together.The bipartisan group unveiled its bill this week; it is slowly inching toward a vote, though Senate Minority Leader Mitch McConnell (R-Ky.) is doing everything he can to slow it down and gum it up. It contains decent chunks of money for things that will indirectly help clean energy — transmission, demonstration projects, R&D — but it lacks anything that will directly confront fossil fuels in the coming decade, the sine qua non of adequate climate policy. As Robinson Meyer argues in The Atlantic, it is not a climate bill, not really. There’s no guarantee the bipartisan bill will pass, and there’s no way to know how the Senate’s bipartisanship fetishists, Sens. Joe Manchin (D-W.V.) and Kyrsten Sinema (D-Ariz.), will react if it doesn’t.But whether it passes or not, when it comes to decent climate policy, it’s all about the reconciliation bill. There won’t be another bill this big while Democrats control Congress, and they won’t control Congress for long. What Democrats are able to get through in the reconciliation bill is likely to be the last big federal climate legislation for a decade at least. This is the key thing to understand, so I’m going to repeat it: What Democrats are able to get through in the reconciliation bill is likely to be the last big federal climate legislation for a decade at least.(You may be thinking: can’t Democrats do another reconciliation bill next year? Yes, they can, but the midterms will be in full swing, moderates will be feeling even more cowardly than usual, political appetite for big spending will have dried up in the face of a recovering economy, and focus will have turned, hopefully, to voting reform. This one is it.)Absent substantial federal voting reform — which is looking less and less likely, certainly nothing anyone should bet on — all signs point toward Republicans taking back the House in 2022. It’s unclear what will happen in the Senate, but regardless, if the GOP controls either house, no climate legislation will pass (and no voting reform). Republican presidential candidates can win despite larger and larger losses in the popular vote. And the chances of Democrats controlling both houses of Congress again are only getting dimmer. The structural advantages that favor the GOP in the US system are only tilting further in its favor, while the party is actively extending those advantages with a wave of voter-suppression laws at the state level and an accompanying wave of gerrymandering, which alone could win t