the brienzas have come up with a seductive alternativhe recycle th from the computers. >> so this is that solutioni was talking about with the city. >> reporter: the brienzas have concocted a box toouse 108 machines, on building rooftops, say, to vent and recycle t heat free of charge. >> a greenhouse, a pool, a spa, a community center, something along those lines.te >> rep: mayor read, the economist, finds the idea downright intriguing. >> imagine a hot house tomato indoor growing facility, that's heated by abundant excess heat from a bitcoin operation. >> reporter: so, plattsburgh, new york, could become the model for efficient bitcoin mining? >> exactly, that's my goal, to figure out a way to turn this liability into a hugt for us, and communities all around the world. >> reporter: for the pbs newshour, this is economics correspondent paultsolman in platburgh, new york. >> woodruff: next tonigher feeding a huand stoking the appetite, for reading in african schools and libraries. fred de sam lazaro has this report. it's the latest in hisfoeries, "agentchange." >> pretty much what w