"My everyday actions to save the environment center around minimalism - owning and using only the resources that I need for happiness. Because ALL forms of consumption come from the environment, I can't make something better by consuming less.
Instead, by consuming less, I'm merely destroying less environment."
By far the biggest lifestyle factor my wife and I have chosen for the environment is being childfree. Adding another person to the 8 billion already here undoes our efforts to consume less by a factor of around 40x! To be clear, we are certainly NOT against having children - it's just not something we want.