These are U.S. specific, and may or may not be an issue elsewhere. In no particular order:
Stop putting crap (unless it was before composting, literally crap) on your lawn. It doesn't stay there, the lawn doesn't need it, and when it comes to cases, you don't need the lawn.
Use your clothes, shoes, and home furnishings until they wear out, not until they bore you or are out of fashion. You can afford it, the world cannot.
Ditto for your car, unless you truly need it, and the new one is, say, at least a third more efficient.
Don't eat beef. Eat less meat.
Raise your children to understand the meaning of having "enough." This is a pretty odd concept in our culture, but "enough" turns out to be a lot less than you think.
More learning, less believing. You can't argue with a belief, and the most closely held ones are often the most harmful and the most wrong. If you don't know, find out. Once you know, you don't need to fall back on belief.
A vacation needn't involve an aircraft, or even a car (my longest by bicycle was only 2,000km, but I hiked 3,500km a few years ago).
If you need to get in a car to go running, cycling, or to work out, you are doing something seriously wrong.
Insulate your home. Insulate it again and install decent windows.
LEDs are not your enemy