Thermodynamically it doesn't even seem like cultured meat should be any better than traditional meat. Sure you are making more stuff than just meat, but like nearly 100% of the animal ends up being used in some capacity for different sources that now all need a synthetic alternative developed that happens to be better for the environment than the old way of using a cow. Call me incredulous but I feel like it would be better to just figure out how to lower the environmental costs of having the cow. You have this sytem that already works fine to generate meat and a host of other products from known inputs. Why reinvent the wheel? Just make a better wheel. Capture the methane. Farm feedcrops in sustainable ways. Treat the animal with respect over its life.