**6. Conclusion**

Humans has experienced energy transitions throughout its history and the current transition from fossil energy to renewable energy is the latest example. But this latest example is different: this energy transition results from the threat of global warming—which is generally attributed to the short-term increasing of carbon dioxide in the atmosphere but also to the long-term heat threat posed by a warming Sun, according to the Gaia theory. Appreciation of the nature of this combination of proximate cause and ultimate cause necessitates for us to take a systems-thinking about the Earth system as a whole. Energy transition to renewable energy is certainly correct, especially reassuring since solar energy received by the Earth is 6,900 times of the energy needs of humans. The solution would be then how to convert a small part of which into useful forms for human consumption.

But justification of such a step in the narrow terms of energy is wrong. Humans face existential threat of global warming as *heat threat* from the Sun, not as energy threat of running out of fossil fuels. Solving Earth's heat threat necessitates us to take consideration of its proximate and ultimate causes with systems-thinking framework in terms of the management of EGP. Only by taking this perspective, we can address the root-issue of the heat threat—as well as seeing a warming Sun as both threat and opportunity. One of the opportunities is electrification of space heating, a paradigmatic example of systems solutions. Other possible solutions may be formulated by taking systems-thinking in terms of the management of EGP that may address some of humans' *Existential Risk and the Future of Humanity* [2]*.*

*Entropy and Exergy in Renewable Energy*
