Oh no! We're going to cause global warming on Mars now!
Fat chance on that, this country hasn't done anything really the right way since they whacked JFK and killed his original space program. Furthermore I highly doubt that the Mars gig is actually going to happen, aerospace is being privatized and this means corporations cutting corners, and that trip I sure as shit wouldn't want to buy a ticket for nor would I get on a craft at gunpoint. After they have actually reliably created airplane style access to space to reliably test zero G propulsion systems and have a working solution, then space travel might be within reach, the reality is things have only gotten worse for that. I'd wager the Russky's will do it first, the world will have to get past that thing of wanting to use the He3 on the moon for nukes rather than zero G propulsion systems.