Lesson 1

E-books.

Lesson 2

If you must fly, fly commercial.

Lesson 3

During "Earth Hour" turn off the lights in at least one of your mansions.

Lesson 4

And this is the most important one, kiddies: do the opposite of whatever Al Bore tells you to do in that infuriatingly condescending, holier-than-thou, I haven't made a dime off global warming , er I mean climate change , hysteria even though I've done nothing but since leaving the white house and my net worth is more than 7 times what it was then voice of his.