The problem is not the heat, the problem is the greenhouse gasses we’re releasing which trap more of the sun’s heat.

> thousands of megajoules of energy evvery second

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...

[4] https://humoncomics.com/mother-gaia

When the Earth was formed, it was a big ball of hot magma, that cooled off to form the Earth's crust. The core is still molten, and when it cools off, we die. This is not likely to happen for billions of years, so we'll probably figure out some way to handle it by then, but you can rest assured that unless we get a Trantor-like population* heat leaving the planet is a bigger concern than heat released by its inhabitants.

* 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.

Yes