It might sound reductionist, but start with the basics, and realize that a lot of people do the basics wrong. The basics are:
- Reduce
- Reuse
- Recycle
In that order. That's the part people screw up the most. They want to start with recycling, then move to reuse, and THEN reduce. In addition, there's also
{:start="4"} 4. Renew
In which you take into consideration replenishing the earth with the resources you've consumed.