An obvious one, yes, turning off all the lights whenever I leave the house. But I’ll admit, there have been times when I’ve been rushing out the door and left a few on by mistake. Sometimes, on really gloomy days, I’ve justified keeping one or two on for my cat or — and I know this is ridiculous — a vase of flowers that look like they need it. But no more of these excuses. All lights out, every single time I leave.