Grasping the Goal of a Green GDP

After much planning, the US Commerce Department has taken the first step towards measuring the Gross Domestic Product with an environmental perspective. It’s issued a valuation of non-renewable resources such as coal, petroleum and minerals. But greening the GDP has a long way to go  ? economists still can’t seem to agree on the purpose or relevance of the project, let alone how it should be measured. Dale Willman reports.