Terraforming: Can We Turn Mars Into Earth 2.0?

Are there ways to terraform Mars -- that is, make it habitable for humans? Some scientists think so. They have big plans, but they also face some big obstacles.
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Sources:
http://meteorite.unm.edu/site_media/pdf/BringingLife.pdf
http://science.nasa.gov/science-news/science-at-nasa/2001/ast09feb_1/
http://www.fromquarkstoquasars.com/terraforming-mars/
http://www.universetoday.com/9730/zubrin-on-terraforming-mars/
http://science.howstuffworks.com/terraforming.htm
http://www.pbs.org/exploringspace/mars/terraforming/no_flash.html
http://io9.com/5868115/how-we-will-terraform-mars
http://www.marssociety.org/home/press/news/howwewillterraformmars