Regarding Energy, AI or Healthcare, they are probably interconnected, in my opinion : Working in Healthcare will only improve short-term human condition, but i

Regarding Energy, AI or Healthcare, they are probably interconnected, in my opinion : Working in Healthcare will only improve short-term human condition, but it can be a rewarding feeling. Working in Energy will improve both Healthcare, AI and other domains, because those fields require energy to build the machines, the infrastructure, and to maintain them. Working in AI will improve everything, including itself. If you apply AI to research and science, it will potentially help to faster discoverings in all fields, including energy, genomics, materials, operations, and improving AI itself. Now, because that idea of AI is powerful, it breaks current societal schemes about what should be the purpose of humans and work. If you decide to develop AI, you will face more ethical, philosophical and political issues than in the other fields. (for example, "If I develop that piece of AI, X people will lose their jobs". So you have new interesting problems arising to consider first. Other example : "If I develop that AI, X times more people could die if misused", in the military field) The question is more about : do you want to change the world faster at the expense of some other people lives conditions, or do you want to also support the people who had less luck than you, and at what scale. Ultimately, your human feelings will guide you more in your choices than the rationality you think you have. I believe there is no bad choice and you should feel proud of yourself if you acquire a job in any of those 3 fields. You may even change of field in your lifetime, the most important is to start somewhere