The incredible shrinking Al Gore: His 2007 24-hour "Live Earth" event reached 2,000 million people; four years later, his 24-hour "Climate Reality" event allegedly reached 8.5 million people

2007: Live Earth Draws 2 Billion Viewers, Breaks Internet Record

Live Earth successfully wrapped up its 24 hour concert series that spanned seven continents and reached an estimated 2 billion people.

Gore Takes Climate Change Slide Show Around the World in 24 Hours - NYTimes.com

The website's counter indicated 8.5 million people viewed the site while the presentations were streamed live.