re: #485 calochortus
There’s a reason that there are small, midsize, large, CUV, SUV (s/m/l), wagons, pickups (s/m/l), sports cars, etc. Each has merits and value to the consumer for specific situations. Small car might get good gas mileage and is affordable entry car. Wagon might be good for hauling the kids and has moderate gas mileage. Hybrid midsize gives great fuel economy for commuter, but doesn’t help someone who is hauling 4x8 plywood to a worksite, which is why their other car is a F-150 pickup when it’s not busy trashing banjos.
It’s the same way that getting to an efficient home/building can take many forms - higher insulation, reflective materials, absorbent materials, HVAC options, windows, interior design, fixtures, etc. LEED ratings take 100s of factors into account, including recycling materials that are used in the construction phase.
Paris was like either strategy - countries were free to get to a reduction, and could use any method they saw fit.