Robotics engineer Catherine Mohr is tired of enviros “long on moral authority and short on data.” She’s got a smart TED talk clip about the greenest options for (a) wiping up a yogurt spill and (b) building a house. The point in each case is that the best option is often not what you’d expect.

She sorta takes the annoying and all too common tone of “everything you’ve been trying to do out of good faith is wrong and stupid,” which isn’t motivating. But she brings the data and presents it clearly, and that’s worth a shout-out: