[1457389]

Zubrin thinks we can get to Mars with current tech. He has thought that for decades, and his outreach efforts was one of the things that inspired Musk in the first place. He disagrees with the timespan for colonization, yes, but his post here is mainly around optimizations for Musk's proposal, not an outright rejection:

>Still, with some corrections, a system using the core concepts Musk laid out could be made attractive — not just as an imaginative concept for the colonization of Mars, but as a means of meeting the nearer-at-hand challenge of enabling human expeditions to the planet.