[robomatik]

time to begin to terraform mars?

[KevinDavis]

Yep...

[Oberon]

time to begin to terraform mars?

First you'll have to overcome two practically insurmountable obstacles:

1. The lack of atmosphere (about 1 percent the air pressure we have here), and
2. The low ambient temperature.

You'll never overcome item 1 without finding a way to increase the gravity of the planet, and you'll never overcome item 2 without moving the planet closer to the sun. Someday we may have the technical resources and energy cheap enough to artificially maintain an Earth-like climate on Mars in its current dimensions and orbit; but I cannot imagine it happening this century, or for that matter in the next.