We have been building homes largely the same way for the last 75 years. All of a sudden everything from drywall to ducting is on the table. And I am telling you, even though the sexy stuff like solar panels and greywater systems get most of the headlines, it’s the small strategies that add up to big results. Attach a rain barrel to the end of your gutter downspouts and you’ve got free water you can use for your garden.