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In Greece the national broadcaster is on air again, after being closed down to save money. We hear from Greek state TV anchor Prokopis Doukas about the fight to get back on air.

We look ahead to the G8 world leaders meeting - and a chance for a free trade agreement between Europe and America. And, we find out about China's new carbon emissions trading scheme.

Astronaut Buzz Aldrin at the Paris Airshow tells us why humans should be heading for Mars. Plus, we discuss whether walking is the key to the most modern and technologically advanced cities with Economist Peter Morici in Washington and Sanjeev Sanyal of Deutsche Bank in Singapore.