Use CFLs where you need bright light and LEDs where you just need a little ambient light.
Buy only Energy Star rated appliances. Make sure the old, inefficient ones will be junked. Yes, I know poor folks rely on refurbished appliances, I did when I bought this house. You want really inefficient stuff from the 70s out of the system, though, it will kill poor folks on their electric bill. Mine did.
If you want a car in a big city, consider electric. Consider a hybrid for the suburbs/exurbs. If you live where distances are really long like I do and can't afford a hybrid, look at 4 cylinder cars. They have gotten a hell of a lot better since the 60s. Mine can go up La Bajada (engine slayer hill) in fifth gear.
Realize the difference between economy and false economy. Yes, those trendy shoes in the cheap stores are attractive, but the well made shoes that cost four times as much will last eight times as long. Also look at how much clothing you really need. If you've got a huge walk in closet that is stuffed, you're probably doing it wrong, buying cheaply made trends and then storing them in perpetuity when they sag and bag after a few washings or just go out of style at light speed.
Learn how to cook. Learn how to cut up your own chicken. Even if you can't cook your own food from a backyard garden, realize that if you start with fresh stuff you're saving all the energy that went into processing and transportation and you're also not getting salt overload.
Go paperless where you can do it, getting bills in your email inbox and paying online.
Realize this is just a partial list and look for ways to save energy. A lot of people have been doing these things without thinking about them for a long time. Many of us have been doing a lot to decrease our energy use and carbon footprint already. We're just waiting for people to stop voting for Republican assholes so the government can follow us.
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