Watch the full-length episode at http://video.pbs.org/video/2365530573/?Utm_source=youtube&utm_medium=pbsofficial&utm_campaign=hufs_covefullprogram (US Only) HUMANITY FROM SPACE premieres Tuesday, July 21, 2015, 8:00-10:00 p.m. ET on PBS.
The development of steam mechanisation changes humanity’s impact on the world forever. From having been predominantly agriculturally based, Humanity now lives in vast urban settlements which have grown up only over the last couple of hundred years. Although this change is relatively recent our modern global society can now not survive without cities.