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A lot of the benefit hopefully comes from reducing the carbon footprint that would have gone into a cow.

That cow will still be raised unless the higher cost of the meat (via a lower demand for leather due to mycelium) drives down demand (for meat).

For now. But it removes yet another barrier to consume less cows. Humanity solves problems step by step. It's ok if it takes a century.

I don’t think we have a century to solve the problem with greenhouse gases.