Watching this interesting 33 minute video, that I came across at google.org, I learned, for example, these 4 things:
1. Reduce the weight of cars.
2. Rebuild the electric grid to be more flexible and decentralized.
3. Make it possible for people to get real time information over the Internet about the energy use they use at home.
4. At your home, replace old products, that use a lot of energy, with newer products that use less energy. For example, have a look at how much energy your refrigerator uses.