The world has lost an incredible thinker and doer. I have lost an amazing friend. A void exists where before it was filled with David's optimism, humour and joy.
Tom Kenworthy
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Tar Sands Production In America Is Closer Than You Think
Tar sands in Utah, like in Canada, contain a form of petroleum called bitumen that can be refined into gasoline. But the process is costly, energy-intensive, and on a life-cycle basis releases far more global warming pollutants than conventional oil refining operations.
