In his speech in Constitution Hall this week, former Vice President and renewable energy investor Al Gore extolled a stretch goal challenging America to achieve 100% renewable power within 10 years. The quote: "Today I challenge our nation to commit to producing 100 percent of our electricity from renewable energy and truly clean carbon-free sources within 10 years." And my favorite part: "When President John F. Kennedy challenged our nation to land a man on the moon and bring him back safely in 10 years, many people doubted we could accomplish that goal. But 8 years and 2 months later,...