I would like to order one infinity of energy from you, then. Please deliver it to my email address, as I'd rather not actually receive it directly to my house.
I'm actually the first to say that A: it's all energy and atoms in the end and B: the universe is awash with both and it's mostly our own stubborness that prevents us from claiming both since we don't "like" nuclear. However, even a Kardeshev Type III civilization will have to contend with the fact that its resources are finite, and as rapidly as its ability to exploit them grows, its desires are likely to grow even faster.
It's not capitalism that causes that, either... a great deal of our desires expanding faster than our resources predates the entire concept, and the problem will likely outlast it as well.
There is nothing wrong with desire, in fact desire is good. There is problem with non-sustainable practices that damage the environment which includes people.
What you're stating as an issue comes down to management, resource management and people management. Capitalism has played a role in allowing us to see what is possible when we allow people to pool large amounts of resources, when people's efforts can be directed towards a specific goal - incentivized by the organization's leadership to aim for profits. Money is a concept which is important to remember when we're talking in theoretical terms. Money is time, time is money. What can we do with unlimited money?
I'm actually the first to say that A: it's all energy and atoms in the end and B: the universe is awash with both and it's mostly our own stubborness that prevents us from claiming both since we don't "like" nuclear. However, even a Kardeshev Type III civilization will have to contend with the fact that its resources are finite, and as rapidly as its ability to exploit them grows, its desires are likely to grow even faster.
It's not capitalism that causes that, either... a great deal of our desires expanding faster than our resources predates the entire concept, and the problem will likely outlast it as well.