Rome wasn't built in a day, and we won't replace fossil fuels with clean energy based on the events of a single week, either. But the important thing to remember is that, once they happen, clean energy victories are irreversible. No one will tear down wind farms because they are nostalgic for fracking in our watersheds. And nobody will pull down their solar panels because they miss having mercury in their tuna or asthma inhalers for their kids. Because once we leave fossil fuels behind, we are never going back.