Why he wants to track humankind's journey around the world

Two-time Pulitzer Prize winner Paul Salopek is on an intercontinental journey of 24,000 miles, tracing humankind's movement out of Africa right down to South America.Nikita Puri traces his passage......

Wall Street bankers go 'green'

The financial district of Wall Street is slowly turning 'green'. Pressed by environmentalists and in increasing evidence that global warming could play havoc in a not too-distant-future, elite......