Reuters: The future of solar energy may be small — small scale, that is. The climate change and energy policy bill winding its way through the U.S. Congress shows a new federal eagerness to build a renewable energy future, but what specifically to build where is still up for debate. Massive solar arrays of mirrors and photovoltaic panels harnessing desert sun on otherwise-worthless land are the cliches of clean energy, but environmentalists and homeowners suing to preserve species and …