23 Jun '11, 8pm

Listen to our podcast with NASA scientist James Hansen, just as a lawsuit is unleashed by a conservative group.

TreeHugger: You wrote recently about a proposed pipeline for tar sand extracts, saying: "the phase out of emissions from coal is, itself, an enormous challenge. However, if the tar sands are thrown into the mix, it's essentially game over." What are tar sands and what makes this such a huge liability? Hansen: The tar sands are the deposits, primarily in Canada, where there's oil mixed with sand. And you can extract the oil but it's a very energy-intensive process. So you end up emitting a lot more carbon dioxide than you would in a pure oil deposit. So it's not a very efficient way to get energy. But the basic point is that we know there's enough CO2 in the easily available oil and gas to take us up to the dangerous level of atmospheric CO2. And what that means is that we can't afford to develop these unconventional fossil fuels. It just will push us far into the dangerous...

Full article: http://www.treehugger.com/files/2011/06/treehugger-radio-...

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