i'm concerned could there be a better way or it's the cost of evolution
On a planetary scale, gigawatts are nothing. The total amount of energy that Earth receives from the Sun is about 100,000,000,000 megajoules of energy every second, 99%+ of which gets dissipated as heat.
If this is about the climate, then it's important to remember that climate change and pollution ultimately are not a meaningful threat to Earth as a planet - both Earth and its life have been through far far worse[0][1][2][3]. They are only a threat to humans[4].
[0] https://en.wikipedia.org/wiki/Great_Oxidation_Event
[1] https://en.wikipedia.org/wiki/Snowball_Earth
[2] https://en.wikipedia.org/wiki/Permian%E2%80%93Triassic_extin...
[3] https://en.wikipedia.org/wiki/Paleocene%E2%80%93Eocene_therm...
* Going off of Asimov's description of the population density, not the numbers he mentioned, which were orders of magnitude lower than how he described it.