Tar sands crude is both more toxic and much harder to clean than ordinary oil.
Fort Bliss, a base near El Paso, is a hotbed of solar power and other green energy initiatives.
If our generations had been around in the 1930s, we'd still be in the Great Depression with prominent lawmakers telling each other we need a smaller government.
Already, the California Teachers' Pension Fund, the state of Vermont, the city of Seattle, and students across the nation are working on divestment campaigns that will speed the transition to renewable energy.
Obama's State of the Union address nudged the debate in the right direction, but not far enough.
President Obama has the power to make the transformation to a clean-energy economy.
It's up to Obama to stop the Keystone XL tar sands pipeline.
If there's one issue for President Obama to stake his entire second term on, it's the climate.