[friedturkey]

With a move away from fossil fuels, CO2 will become less of a concern.

[dtgriscom]

We're going to be worried about CO2 for a long, long time.

[jacobolus]

The point is that if energy is produced using non-fossil-fuel sources, then increasing energy intensity of industrial processes will not necessarily output more CO2.

That is, using coal power to make make energy-intensive mushroom-based packaging is probably ecologically net-negative, but if you can use solar or geothermal power it might not be.