What's not a solved problem is our disappearing fisheries[1], rhinos going extinct all over the place[2], farmland desertification[3], tropical deforestation[4], ocean acidification[5]... From my back of the envelope math, it seems that longer lives and a larger population will exacerbate our environmental and resource issues.
I'd like to see billionaires purchase large tracks of land simply for preservation. Cleaning up industrial waste from rivers. Foot the salaries of anti-poaching efforts. Get clean fusion energy production up and running. That sort of thing. Perhaps we should get our planet's shit together before tackling immortality?
[1] http://www.washingtonpost.com/posteverything/wp/2014/06/03/t...
[2] http://www.cnn.com/2015/04/16/africa/kenya-northern-white-rh...
[3] http://www.bbc.com/news/world-africa-34790661
[4] http://www.theguardian.com/commentisfree/2015/oct/30/indones...
[5] http://fm.kuac.org/post/increasing-ocean-acidity-threatens-m...