Robin Johnson's Economics Webpage has moved to http://homepages.paradise.net.nz/johnso14.
Robin Johnson's old Webpage at Geocities is no longer there, as Yahoo withdew the free home page service.
I found another talk by James Hansen on the internet. Hansen gave the talk to the Center for Science Writings (CSW) at Stevens Institute of Technology after they had given him another award for his book Storms of my Grandchildren.
Facing the Truth About Global Warming