Until we fully understand what turned two brothers who allegedly perpetrated the Boston Marathon bombings into murderers, it is hard to make any policy recommendation other than this: We need to redouble our efforts to make America stronger and healthier so it remains a vibrant counterexample to whatever bigoted ideology may have gripped these young men....And the best place to start is with a carbon tax.

Until we fully understand what turned two brothers who allegedly perpetrated the Boston Marathon bombings into murderers, it is hard to make any policy recommendation other than this: We need to redouble our efforts to make America stronger and healthier so it remains a vibrant counterexample to whatever bigoted ideology may have gripped these young men....And the best place to start is with a carbon tax.

A generation ago [the Democratic Party] stood for progressive change. Now they defend every federal program as if each were sacred. They have become the most conservative force in American politics.

Do you know what my favorite renewable fuel is? An ecosystem for innovation.

If we don't have a more serious energy policy, the difference between a good day and bad day for America from here on will hinge on how the 86-year-old king of Saudi Arabia manages...change.

The Arab awakening was like watching elephants fly: something you didn't expect, something you haven't seen before, "Wow, elephants fly."

The historical debate is over. The answer is free-market capitalism.