Tax details of US super-rich allegedly leaked

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How much tax do America's billionaires pay? Not much, it appears. We speak to an investigative journalist who says some have been paying NO tax - and even been receiving tax credit for their children. Tax is also on the agenda for the G7 rich countries who have plans to do away with tax havens. We'll be finding out if they can really achieve that. Also a new report says climate change not only threatens species and our oceans - it threatens our homes too. Hundreds of millions of them face destruction thanks to the changing weather. We'll be finding out exactly why they are under threat.