The author makes the (perfectly plausible) assumption that there's no other life out there. Imposing our "idea of happiness" (or whatever other measure you want to use) on the lifeless universe would certainly not be unethical.

well when we find an alternative viewpoint then we can have an honest debate about it but until then whats the point in waiting.

I mean if you just look at all the energy sun is 'wasting' at every moment throughout its 5B yr lifespan wouldnt that be better utilized by creating more life and more branches for evolution? if thats true for one star then imagine what can be achieved throughout the galaxy!

Please go on and elaborate on that point, would you? The folks at home fret about recycling while the Sun is busy wasting 99% of the energy we might ever be able to use.

Surely, the star at the center of our solar system is the biggest polluter. Can you argue otherwise?

Can you elaborate? What is humanity's idea of happiness, and who/what are we potentially enforcing it on?

Assuming there's a single humanity's idea of happiness in the first place.