Explanation:

• The development of “oil shale” (not to be confused with “shale oil”) and “tar sands” has been shown to be environmentally destructive, and water and energy intensive.
• Extracting oil for oil shale or tar sands would deal a disastrous blow to any hope of reducing atmospheric CO2 levels to below 350 parts per million — the level we need to reach soon to stabilize Earth’s climate.
• Besides helping push us toward global warming catastrophe, oil shale and tar sands development destroys species habitat, wastes enormous volumes of water, pollutes air and water, and degrades and defiles vast swaths of land.
• It is also costly to extract oil shale and tar sands.