Morality and Athiesm

There has been a fair bit of debate about how atheists can have morality without some external source providing it. I'm personally in it for the survival of the species. Eventually the earth will be consumed by some catastrophe that will make human life upon it an impossibility. Before that point we have to have colonized other worlds or face extinction. To do so requires a huge number of human beings working in cooperation. Happy people are cooperative people. Therefore it only makes sense to make others happy. Behaving in a moral and ethical manner will tend to increase the percentage of people who are happy.