I think the point is the more useful energy we have at our disposal, the more garbage we can make easily.

When you observe historical data, you see that the graphs of the amount of energy we are able to master are roughly proportional to the graphs of our emissions of garbage (construction, pollution, CO2, consumer goods etc.).

I'm not saying I don't want fusion, I'm saying that without getting much better at deciding collectively what to do with it then those graphs will stay coupled, taking us to a sure doom.

Anyway it's likely we'll get there before fusion so it should not distract us from all other necessary transformations the system needs.