If all goes according to plan, Hollywood icon Leonardo DiCaprio will blast into space aboard the maiden voyage of Richard Branson's Virgin Galactic spaceship sometime this year, opening up a new era of civilian space travel. This development might only be remarkable as the fulfillment of a dream long predicted by futurists and technophiles, were it not for the fact that Messrs. Branson and DiCaprio are prominent environmentalist celebrities who have warned of a coming ecological catastrophe if we fail to address our carbon problem.

Mr....