Space mirrors could create Earth-like haven on Mars - space - 14 November 2006 - New Scientist Space

"Mirrors in orbit around Mars could create Earth-like conditions on a
small patch of the planet's surface, according to a NASA-funded study.
The extra sunlight would provide warmth and solar power for human
explorers, but some experts say the mirrors may be hard to deploy.

Scientists and science-fiction authors have long dreamed of turning
Mars into a more Earth-like planet for future human colonists. The
process, called terraforming, involves thickening Mars's atmosphere and
increasing its temperature. But schemes to transform the entire planet
would take centuries and would require enormous resources."

More at http://space.newscientist.com/article.ns?id=dn10573