I am not an expert but I am a PhD chemical engineer and I have though about this issue for years and years.
My 0.02...
Short term
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a) give houses smaller trash cans and charge a lot for bigger trash cans. Town I live in already does this... at first I was like "wtf with this tiny trash can... I can throw away like one, two bags of trash tops per week"... well, now my household of 4 averages one bag of half full bag of trash per week. we do more composting and more recycling.
b) double down on recycling programs and sorting.
Short- to Mid-term
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c) we should be burning 100% of our actual trash in localized facilities. We trade the negative of immediate CO2 green gas emissions but we get:
-- some power in return
-- reduced diesel fuel use (at like 4 miles a gallon)... assuming the trip to local burn facility is shorter than out of landfill
-- huge reduction methane release from landfill,
-- 100% elimination of continued landfill pollution and water table pollution by god knows what (drugs, plastics, leaking batteries, etc.
The CO2 effluent stream can be captured and processed in many interesting ways. The CO2 is so clean it can be used for beverage or biotech service and/or feed for a CO2 to polymer (plastic building block) plant.
Many modern burn facilities burn so hot [and completely] they could be certified to deal with bio-hazard and chemical weapon destruction. They have gas scrubbing systems advamced enough that only N2, O2, and CO2 are emitted from the plant (NOx, SOx, etc. level are parts per billion levels)... no complex chemical species, no metals, leave the plant through the gas effluent.
We were/are doing this... but all this NIMBY nonsense is leading to some collectively destructive group-think... many folks don't want to see burn facilities near their house and there is a lot of money to be made in our current trash mismanagement system. Actually, most of our thinking is collectively destructive group-think so "what's new?"
Edit: http://www.lacsd.org/solidwaste/swfacilities/rtefac/commerce...
I visited that facility in the 90's... it was great. Now it is closing... not sure if it being replaced.
Long-term
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d)We need packaging laws and taxes that address waste caused by excessive/unnecessary packaging... particularly for commercial/industrial use.
e)Society needs to refocus our value system to value simplicity and localized self-sufficiency: local fresh food over packaged/frozen goods, more reusable (and infinitely recycle-able) locally filled glass containers
f) localized recycle-to-manufacturing pipelines. Imagine a future where you could take polyethylene scrap down to a local facility get it 3D printed into something you or someone else can use (or get a spool of PE line to use in your own 3D printer at home).