Obviously carbon neutral is a Very Good Thing, but after seeing this nifty prefab from Melbourne architects ArchiBlox, we’re cranking it up a notch and pronouncing carbon positive FTW. Making an impressive debut at Melbourne’s Sustainable Living Festival, this future-perfect home has solar water and power; giant, temperature-regulating windows; and more insulation than you can shake a climate-controlled stick at.

As well as generating more energy than it uses, architect Bill McCorkell’s creation also boasts the delightfully green touches of food planters and a grass-covered roof. We’re now dreaming of a world where new buildings give back more than they take in. And negative-calorie cake. We dream of that every day.