The cooperation of NASCAR - or any other system, it turns out - persists only when everyone believes he has the opportunity to win.

The waste from power plants is essentially what is left over when you burn coal. And as we all know, coal is a relatively dirty mineral.

If you believe you can change - if you make it a habit - the change becomes real.

America is the Saudi Arabia of coal.

What we know from lab studies is that it's never too late to break a habit. Habits are malleable throughout your entire life. But we also know that the best way to change a habit is to understand its structure - that once you tell people about the cue and the reward and you force them to recognize what those factors are in a behavior, it becomes much, much easier to change.

The Golden Rule of Habit Change: You can't extinguish a bad habit, you can only change it.

For a habit to stay changed, people must believe change is possible.