Ever get a sunburn?
The sun hitting the planet at a given moment is on the order of 100 petawatts. Human energy utilization is on the order of 15 terawatts. It's a really good thing that it isn't zero sum.
We use a fraction of the energy hitting the earth because we can only extract a fraction of it. In this case rate of replenishment functions as a limit. If our rate of usage exceeds the rate in which we can viably extract useful energy from the sun then that means not everyone can have access to this energy. This is a limit. Zero Sum.
If Energy truly was unlimited nobody would be paying for it.
Trees don't pay for energy.
Trees compete for light. The taller trees win, the shorter trees are deprived of sunlight and therefore are the losers.
Any economic model of society that doesn't involve the zero sum nature of reality is highly highly inaccurate.
Are your comments meant to be some kind of elaborate satire?