Zubrin has had his day. Manned exploration of Mars is in the new NASA planning spirals. Best bet now is to support NASA, and of course to advocate withdrawal from the 1967 UN Outer Space Treaty and establishment of property rights.
He is one of the most continuously morose individuals (beside myself) I have ever known. Perhaps Dorothy Parker was in the same league; I dunno.
But Zubrin's problem (IMHO) is that the whole Earth has not lept up and embraced his vision, abandoned whatever they were doing, and started to work on getting to Mars.
I have felt something similar at times, but he positively radiates it. Is there a chemical that could help?
--Boris