Someone mentioned newer, energy efficient appliances and fridges.
The problem there, fridges in particular, is often poor quality, leading to replacement being required way sooner than it should on the newer, energy efficient ones.
What fails are usually the control mechanisms, which can be bypassed by a simple digital temp controller available on Amazon wired direct to switch the compressor on and off as needed. You're back to having to defrost now and again but I would guess you're running more efficiently that way than when you were using a heater to self defrost or the overall disposal carbon costs of a fairly new unit that's unreliable so being tossed... so there's one possible eco-fix for that one?
Someone also mentioned fluorocarbons and the like and refrigeration equipment leaking/losing their refrigerant on disposal or resulting from planned obsolescence design is a big contributor.
Career #1 for me was mechanic and I'm still driving vehicles from the 70s and 80s, being able to fix them myself or even make parts if needed. Not having to replace vehicles regularly over the decades has to be somewhat of a carbon win.
Speaking of planned obsolescence, I was talking with an engineer from a major German luxury car maker and he was telling me they are now directed to redesign major engine parts to deliberately fail at what would be the end of a lease period, approximately 4 years.
Criminal corporate behavior.
Covid has also taught me I really don't need to drive much, maybe an errand run once a week and one or two other trips.
I'm retired so the work commute is gone.
Much as I dislike a lot about Amazon, they get abstract points for being there to deliver essentials during a plague. No matter which side of the "what you should do about Covid" debate you come down on, not interacting with others is one of the best strategies you can use for avoiding infection.
I'm pretty sure what amazon is doing is also more carbon efficient than me running errands in one of my steel dinosaurs.
Dark humor = if you died from Covid, have you have reached no-carbon nirvana?
All the grass is slowly becoming garden or food forest. I have 50 year old lawn tractors ( thank you for your long lost and forgotten past decency in design John Deere ) that I use to mow what's left.
I'm thinking it's time for a scythe for that: https://scythesupply.com
I was a bookseller for years and my walls at home are lined with shelves holding the books I wanted to keep from ceiling to floor.
The amount that mass of paper helped with the thermal cycling is surprising, cooler much longer into the heat of the day, likewise warmer into the winter cold at night.
Along the same lines, many barrels of water in my greenhouse brought me through the winter and some freezes in the twenties with no additional heat required. It is N. Florida so I'm not sure how that would do in a prolonged freeze because we haven't had one since the 80s.
I suspect that as long as the sun is out it might be enough heat storage for that.
More dark humor of a sort, we have a Grand Solar Minimum coming up, which should lead to way colder temperatures, but NOAA and others think all the carbon and greenhouse gasses may balance that effect to where there isn't much change.
I'm sure the oil and coal companies will be thrilled.
Thermal shades on the windows made an amazing difference in how much heating/cooling required.
They're not expensive to replace/repair if something goes wrong either...like double pane windows that fail terminally are.
I deliberately chose to live small, in 500 sq. ft. of living space with low ceilings to reduce heat/cool costs.
It's just me and my dog so that's plenty of room.
For years I was able to live well on 20K a year for 20 hours a week work.
That worked because I have a wide range of repair/build skills and lots of valuable-to-employer skills, so was always paid well for my work time.
I had some great little businesses that worked well that way too.
Some of those businesses were carbon hogs (glassblowing studio) but I and many others did a lot of work over the years designing equipment for that to minimize the carbon input and open sourcing the how-to.
The forum where we shared all that has to get some carbon points for getting that info out there.
Most kinds or work burn carbon by the hour...just a question of how much.