Google wants to guilt you into installing solar panels on your roof

Google is hoping that some good old-fashioned peer pressure will push more people to embrace solar energy. 

Project Sunroof, the search giant's solar panel mapping tool and calculator, is adding a nosy new feature, Data Explorer. Now, when you pull up an address using the tool, which visualizes how much sunlight hits each building in an area, you won't just see which roof is best suited to harness solar energy. You'll also be able to select an option to check out a map tracking every rooftop that's already outfitted with solar panels in the area.