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

Photos by Alexander Gronsky.

Sustainable energy transforms lives in rural Kenya.

Eco-design in the Canadian Shield.

Desolate depictions of the American landscape.

Brooklyn artist turns destestable objects into things of beauty.

Go Tar Heels.

Renewable power is cheaper and safer, military leaders say.

Norman Foster's visionary city rises outside Abu Dhabi.