Lester Brown reports on the proliferation of solar rooftop water heaters at Sustainablog:
The pace of solar energy development is accelerating as the installation of rooftop solar water heaters takes off. Unlike solar photovoltaic (PV) panels that convert solar radiation into electricity, these “solar thermal collectors” use the sun’s energy to heat water, space, or both.
Source: sustainablog (http://s.tt/14T9R)
