Oil and gas sector are going to make you money, believe me. I've been involved with the both and I can safely say that this project deserves your attention.
Can't overlook the fact that it is also good for the environment.
Yes, the gas and oil sector is stable. Despite the new green energy, etc. I do not know what can lead to a global change in the demand for these resources.
Even if such changes occur, there is still a long time to work quietly in this sector of the economy.