Replace windows/doors with energy efficient windows/doors. Old leaded glass windows, especially ones with a draft (they don't seal properly) create major heat/cooling loss. Make sure that your home has proper insulation as well. In an effort to cut costs many homes are inadequately insulated.
Small steps are to replace all bulbs with EE bulbs that can be found almost anywhere. They cost a bit more but pay for themselves with energy savings. Turn off lights that are not in use, take shorter showers, lower the temp on your water heater, and use less AC and heat (ie set heat to 65 instead of 70).
Outdated heating and cooling systems are incredibly inefficient also.
you can use your computer & tv less
Putting new windows in the home will not make the house more energy efficient. There would have to be a specific type of glass in the window.
Using a more efficient washer and dryer along with an energy efficient dishwasher will save a good amount of money as well as changing to energy efficient bulbs.
The engine was cleaner and more efficient.
EnergySavers.gov has a great list of things you can do to improve energy efficiency. A few of the best ideas are adding insulation, a programmable thermostat, and using energy efficient appliances.
The home keys on the keyboard make typing more efficient because the other fingers then know where to be while typing. The home keys are "F" and "J" on the letter keyboard and "5" on the number keypad.
Tires are complicated and you have to do your own home work.It's nice to get the ones that make your car more efficient though.
Turn it down
Kick it
Gas central heating is more efficient than electric.Open cast mining can be more efficient than deep mines.
They learn to specialize to become more efficient and make greater profits.
They learn to specialize to become more efficient and make greater profits.
Gas heaters are much more efficient. Electric resistance heaters are, by nature, hideously inefficient.