I watched it too. I am always sensitive to the enviro leftist agenda. I did not sense any of that in this show. There were spots where it talked about man's impact on ocean stock, animal populations and even scavenger birds that thrive off our garbage. It then went on to postulate about the recovery of the oceans, drop off of bird populations that depended on our garbage. I found the scientists discussing this in a realistic sense and not trying to "blame humans."
I thought it to be an objective discussion of what would indeed happen. The part that was most interesting to me was the discussion of the physical decay of modern cities into the landscape.