Professor Michael Gratzel is the planet’s next hero. Gratzel recently won this year’s Millennium Technology Prize, a competition that seeks out the most innovative life-enhancing technology, with his dye-sensitized solar cells (DSC). DSC are not as efficient as silicone solar cells, but unlike silicone they’re made organically and are inexpensive to produce, two factors that will hopefully make them ubiquitous in no time. Extremely lightweight, DSC can be folded up for transportation and applied to glass. They go on clear or can be tinted any number of colors from dyes made from crushed fruit. That means every pane of glass in any structure can be used to generate solar power – think of what that would mean for a 90-story office building.