Air does NOT GROW on Trees!: Not on Mars it doesn't!

Colonizing Mars is very dangerous. I want to help make it safer for those astronauts who are brave enough to make this their adventure of a lifetime. I hope my ideas help. I hope my questions and perspective promote conversation that helps hash out the dangers and weed out potential disasters and allows those brave men and women to not only live on Mars but to thrive and return home to Earth, safely.