Hopscotch ( 86 minutes) $ 29.95 AT the beginning of this remarkable film about maverick architect Michael Reynolds, who has spent 35 years in the desert of New Mexico tinkering with radically sustainable housing, he says: If humanity takes the planet down the tubes, I’m dead. I’m just trying to save my ass.’’ Of course he’s talking about the environment. But his blueprints for houses that create their own water, heat themselves, and grow their own food could be more than just a radical greenie’s solution to the big bad industrial world. If the global economy keeps up its dying swan act we may need solutions such as those proposed by Reynolds far sooner even than he imagined. Far removed from the uptight, sanctimonious environmental warriors we all have shoved down our throats at their every opportunity, Reynolds is kind of lovable, in the way hippies who move to the bush to grow their own food often are. But Reynolds is no half-educated, Leary-esque drop-out. Highly qualified, he came to the conclusion early that most modern architecture had little to do with the environment and even less to do with the real needs of people. Showing us around his latest self-built house, he says: We’re sitting on 6000 gallons [ 27,000 litres] of water, food growing, sewage internalised, 21 degrees, year round. A family of four could totally survive here without even going to the store.’’ Perhaps the most useful DVD you’ll see as our uncertain future looms.