Each week our friends at Inhabitat recap the week's most interesting green developments and clean tech news for us -- it's the Week in Green.

With summer in full swing, this week Inhabitat watched the mercury rise as the world's largest thermostat burst forth with an array of 72,000 building-mounted LEDs. We also kept things cool with a remarkable plan to transform frozen construction sites into event-hosting urban icebergs. And if you haven't made plans for a summer vacation yet, might we recommend this stunning Swedish "Treehotel" housed within a silvery mirror cube in the sky?

Heartening news rang forth from the renewable energy sector this week as a UN-backed study reported that the building of new renewable energy plants has officially overtaken fossil fuel plants in Europe and the US. We also took a look at two brand new types of power plants -- the world's first hydrogen-driven power plant in Italy and the first hybrid coal-solar power plant in Colorado.

The past week also saw several remarkable advances in clean tech, starting with MIT's latest innovation, a new type of high-tech fiber that can transmit sound, light, and generate electricity. We also paid homage to one of our all-time favorite sources of (surprisingly green) home entertainment - the Roku Box.