Technology is no alternative for love, argues American novelist

Sand art on San Francisco's Ocean Beach

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

Sea lions and penguins at the zoo begin a diet of Marine Stewardship Council-approved fish.

African country reveals plans for world's biggest solar plant.

Company officials are cautiously optimistic after three days of encouraging test results.

Move follows plastic bag prohibitions by several Californian cities.

Global forest loss slowed over the past decade, with less logging in the Amazon and widespread tree planting in China.