Why? Because she dedicated 45 minutes of her show to an issue that much of her audience probably knows very little about: global warming. These are people who likely never heard of a compact fluorescent light bulb or still think you need to plug in a hybrid car (two topics that were discussed repeatedly).

Laurie David also educated viewers on how they can make small and easy changes in their home (where I learn that the Davids use the same toilet paper as I do). Leo also tours an eco (pronounced by Oprah as "echo") designed home by a couple who lost a daughter to cancer (most likely due to a polluted environment).

Leo also interviews a green car expert, who I believe to be Matt Petersen (someone who occasionally graces the pages of Grist), accompanied by reviews by Consumer Reports.

Now I'm sure that some of us could be nitpicky and point out that a fact or two was wrong or that a particular issue was misrepresented or that Leo wasn't as articulate live has he could be, but overall we share our gratitude with Oprah by thanking her. Seriously.