There’s energy everywhere, the trouble is harnessing it.

We extract power from wind, waves and sunlight, but researchers from Columbia University say there’s another font of untapped energy — water evaporating from lakes and reservoirs across the country. In a new analysis laying out a prospective plan to harness evaporation, they say that up to 325 Gigawatts of energy — 69 percent of US energy generation in 2015 — is potentially available for use. The technique would also reduce levels o