Ice On Mars Means We Can Live There.

As these preliminary experiments are proving, there is plenty of frozen water (ice) and frozen carbon dioxide (dry-ice) on Mars. Once we setup greenhouses, we'll be able to grow plants to eat and produce oxygen. If we need more oxygen, we can make it from the water or the carbon dioxide. Children in college today will quite likely have the opportunity to see their children (or grandchildren) leave Earth for careers on Mars. Their grandchildren may be able to sit around campfires singing songs on Mars. This is a good thing.

Mars Lander Exposes More Ice - Yahoo! News: "NASA's Phoenix Mars Lander used its robotic arm to expose more of the hard icy layer just below the Martian surface so that it can more easily gather a sample of the material for analysis.

The trench, informally called 'Snow White,' was about 8 by 12 inches (20 by 30 centimeters) after digging by the arm Saturday. Mission controllers sent commands to the spacecraft Monday to further extend the length of the trench by about 6 inches (15 centimeters).
Scientists said tests in a lab on Earth suggested more area must be exposed in order to collect a proper sample."

Here is some discussion of how we might make Mars suitable for sustained human occupation:

HowStuffWorks "How Terraforming Mars Will Work": "NASA probes have discovered hints to a warmer past on Mars, one in which water may have flowed and life might have existed. With fluvial evidence mounting that water may still exist in a frozen state on Mars, there are many who suggest that the human race could one day make Mars its second home. Such an effort to colonize Mars would begin with altering the current climate and atmosphere to more closely resemble that of Earth's. The process of transforming the Martian atmosphere to create a more habitable living environment is called terraforming."

In order to survive, Humanity will eventually need to leave Earth:

Terraforming of Mars - Wikipedia, the free encyclopedia: "In the not-too distant future, population growth and demand for resources may create pressure for humans to colonize new habitats such as the surface of the Earth's oceans, the sea floor, near-Earth orbital space, the moon and nearby planets, as well as mine the solar system for energy and materials .[1] Thinking far into the future (in the order of hundreds of millions of years), some scientists point out that the Sun will eventually grow too hot for Earth to sustain life, even before it becomes a red giant star, because all main sequence stars brighten slowly throughout their lifetimes. When this happens, it will become imperative for humans to migrate away to areas farther from the sun if they have any hope of surviving. Through terraforming, humans could make Mars habitable long before this 'deadline'. Mars could then be in the habitable zone for a while, giving humanity some thousand additional years to develop further space technology to settle on the outer rim of the solar system, before Mars becomes uninhabitable due to the sun's increasing heat."