ABC hosted a 2 hour ABC news special, "Earth 2100: Is this the Final Century of Our Civilization?"
It can be watched online in the US by going to ABC.com, clicking on "free episodes", then "ABC news specials", and then selecting the episode "Earth 2100, part 1". When part one ends, select "Earth 2100, part 2"
Individual segments of the show can be viewed at:
Earth 2100 is also on Facebook