You can start by recycling and reusing as much as you can. Then you should also watch your purchases like your next car should be fuel efficient and small as possible. Then I assumed you already have changed all your light bulbs, to more efficient curly ones and lowing your thermostats during the day and especially at night. Also we could be buying electric motor bikes for our short shopping trips, I have a list of them available some in Canada and the U.S. as follows:
www.emmo.ca or www.emmo.com
There are many more let me know of any new ones you might find,thanks!