There are two types of climate inventories that account for emissions either at time of production or time of consumption. Production-based inventories are easier to measure, but consumption-based inventories can be more informative for individual consumers.
I'm mostly familiar with California-centric inventories because I want to influence state and local policies.
There used to be really great consumption-based maps at this site, but I'm not finding them at the moment. Instead here is a per-city breakdown of estimates: https://coolclimate.berkeley.edu/inventory
One thing that takes a very long time to change is transportation. City planning is pretty ossified. Cars have multi-decade lifespans. So starting the change for transportation is a very very urgent need. Diet is far more flexible, and there are innovations such as specific types of algae added to cows' diets that drastically reduce methane emissions. Changing the diet of cows is a far faster change than replacing every consumer's vehicle with a clean one.
The history of environmental action shows that it's very easy to regulate and bring business in line. It when it comes to consumers, it's far far trickier. Tackling meat, which is a quarter of the emissions of the diet of folks, may need to happen eventually but it will have far less impact than legalizing apartments in dense urban cores and allowing people to live without cars.
I'm mostly familiar with California-centric inventories because I want to influence state and local policies.
California State's inventory: https://ww2.arb.ca.gov/ghg-inventory-data
There used to be really great consumption-based maps at this site, but I'm not finding them at the moment. Instead here is a per-city breakdown of estimates: https://coolclimate.berkeley.edu/inventory
One thing that takes a very long time to change is transportation. City planning is pretty ossified. Cars have multi-decade lifespans. So starting the change for transportation is a very very urgent need. Diet is far more flexible, and there are innovations such as specific types of algae added to cows' diets that drastically reduce methane emissions. Changing the diet of cows is a far faster change than replacing every consumer's vehicle with a clean one.
The history of environmental action shows that it's very easy to regulate and bring business in line. It when it comes to consumers, it's far far trickier. Tackling meat, which is a quarter of the emissions of the diet of folks, may need to happen eventually but it will have far less impact than legalizing apartments in dense urban cores and allowing people to live without cars.