The best way is to lead by example! Drive a green car, eat healthy sustainable foods. Put solar panels on your house. Recycle as much as possible. Use energy efficient appliances. Basically, just live the green life and let your actions speak for you. If you get 'preachy' it will only turn them off to the green lifestyle, and if they are real jerks might just try to do things that are not good for the environment just for spite. Walk the walk, and the walk will talk!

I agree that leading by example is the best way to get others to follow a green lifestyle but sometimes this isn't enough. You can try to find ways to help explain why being green is important and find motivators for your family. For example, if money is a big concern, find some small ways that people can save money in everyday things such as shopping as stores that offer discounts if you shop with a cloth bag or changing out bulbs for ones that take up less electricity. Let your family and friends know that even making small changes in their everyday life can have an impact.

It starts with you. If you live this way, then people will eventually see this. You can also make it easy for your family to start. Making it handy for them to put the recycables where they should be, etc. Show your partner how much money you can save by living a green lifestyle. I hope this helps.