I don't believe energy efficiency can be explained in 90 seconds as this video claims but, it does make the point that we can do a lot to reduce fossil fuel use through conservation. Every light you turn off, every energy efficient appliance you use, ever inch of insulation you add to your home, every degree you turn down your thermostat results in lower energy use. The less energy we use, the less fossil fuels we burn to produce power.
While changing our power supply over to renewable sources is an admirable goal and one I hope to see achieved one day, energy conservation is something we can all do right now, today. If every individual took steps to reduce their energy use it could have a great impact in reducing the environmental impact of energy production, and we'd all save a bit of money as well.