My contribution: stop bringing trash home with each and every visit to thre grocery store! Buy things with less packaging, or in packaging that can be easily recycled--less trash IN means less trash OUT.
My methods: using a laundry basket for groceries (even at warehouse stores--eliminates the cardboard boxes), allowing me to carry more into the house at one time, selecting bulk foods, eating mostly raw produce, and using a fireplace for any and all paper stuff (it makes great kindling!). When the shopping's done, the laundry basket goes back into laundry duty.
As for the stuff that does go out, glass gets washed and crushed at the bottom of a metal trash can, aluminum (mostly jar lids--no sodas here) and other cans get washed and separated, paper and thin cardboard go into bags for the fireplace and BBQ pit, and food goes into the compost pile, leaving me only plastic (in the form of thin plastic produce bags, and thin wrapping) and styrofoam (from meat packages)--the styrofoam WAS going to a local daycare center for crafts, but it went out of business. When kindergarten starts up again at the school across the street from me, I'll send my foam there instead.
Egg and berry cartons go back to the health food store where I got them--farmers cut down costs by re-using them. When we could still drink milk, we'd get it in glass bottles, again returnable to the farmer through the health food store.
Any metal and glass ready for the bi-weekly pickup gets put in a nearby neighbor's recycling container, because I live in an apartment with no recycling facilities--besides, I find I'm pulling more OUT of these dumpsters than putting in (this place is a gold mine for dumpster-diving, especially the second week of the month, known as "Eviction Week").
The amount of money to be made from our trash is the reason why it costs to go to the dump--our cities KNOW EXACTLY what a goldmine they have out there, and seek to protect it from can collectors, dumpster divers, metal scroungers, and wood seekers...that should tell you something. Something free is considered worthless to the provider, but something for a fee has attached value to it.