'Paying it forward'. In many ways that is a succinct expression of the major obligation of our existence. Doing things now for the protection and upliftment of relatively helpless future generations, which either don't exist yet or are presently too young to take action themselves. Australians don't have this obligation uniquely – every society on earth shares it equally. But in this country we have opportunities not widely available. We not only have an abundance of brilliant people with great energy and inventiveness, we are comparatively rich and thus can do what others might only dream of.