Is concentrated solar power the future of renewable energy? A Guardian video shines a light on the world's first commercial solar tower.

Eco-cafe in Sydney vies for the title.

As green as it gets: "Living Lab" for clean tech companies unveiled in Holland.

NYC looks to the renewable energy potential of sewage treatment.

As many as 1.5 million new jobs could be created by looming EPA regs, says report.

Canadian project converts waste to clean energy.

Future ecotopia or vision of tragedy? Installation brings climate change into focus.

Photos by Alexander Gronsky.