Episodes are also available as webcasts from the e2 website. I highly recommend this series. It's theme is very well summed-up in the pre-amble at the beginning of each episode.
Was it a conscious decision or a momentary lapse of reason? How did progress take priority over humankind?
Could harnessing the world's energy that allowed our ascent, now be the lynchpin of our downfall?
It's about facing what seem to be insurmountable challenges and seeing them for what they really are - opportunities to reinvent and redesign.