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.

Photos by Alexander Gronsky.

EPA tightens regs on drinking water toxicity.

Financing models make going solar affordable.

Back to the drawing board.