The best replacement for tar sands is oil sands.

The best alternatives to tar sands are rated as following:
★★★★★  oil sands
★★★  oil shale
★  crude oil
★  oil shales
★  conventional oil

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No companions for tar sands have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of tar sands in all years. Click on graph for more.
tar sands
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oil shale