Our thermostats are programmable. Our house was designed twenty-two years ago to be passively solar (with no windows on the north side, overhangs that block heat in the summer, allow sunlight in the winter, and max. insulation in the 6-inch exterior walls, etc.). We use natural gas & highly efficient furnaces (when we added a children's wing to our house, we installed a second small furnace so that half the house can be at a cooler temp) plus we cook most of our food & heat our hot water with gas. Our electricity comes from hydro-power.
We don't use a/c -- we just deal with the heat for the few short weeks in the summer when it is hot and we have planted deciduous trees on the south & west side to block the worst of the summer sun.
I am getting ready to give up my longtime love affair with my Volvo 850 and exchange it (sob) for a newer hybrid... but meanwhile, I don't drive it often or far. I am within walking distance of the stores & libraries and often share rides with friends. When I do drive, I try not to speed since that uses a lot more fuel and so obviously puts out more emissions, so my mpg is between 22-25. We have almost no public transit in this town, so that's out. I try to have at least one day a week where I don't drive at all. My kids drive good gas mileage cars (averaging 35 and 45 mpg). We have an older SUV but it gets 20-22 mpg and is only used when needed. Mr. Piffka drive a company vehicle. Our boats are powered by oars or wind.
We've removed almost all the lawn and rarely water or mow. Most of the landscape around the house doesn't require any watering and we've kept our big trees and planted others. We do keep up a fountain with an electric pump, but it is good for the wildlife & provides a cooling effect.
I've talked to a guy about installing solar panels -- it isn't that efficient here and expensive but we're considering it anyway. We have installed energy efficient lightbulbs, both fluorescent and halogen almost everywhere.
Some places where I could improve... besides the car... not go on airplane trips (of course, this is hard to do), turn off computers & TVs at the surge protector to shut off the "ghost" energy use; grow more food and buy more from local sources. We've also noticed that we've got some heat leaks in the house & will be dealing with those.
Although it doesn't affect emissions exactly we have recycled aluminum & metal, donated under-used items frequently & not used yard poisons since the 70's. Glass & plastic have been recycled since the mid-90's. Our yard waste goes to a recycler to be composted.