A doctor friend of mine who spent several years on the mission field training basic medical care providers in villages, told me this many times:

“A hydrogeologist can do more to improve basic health in a village than a doctor can. If you don’t have clean water, you don’t have health.

This doesn’t take anything away from the importance of doctors in developing nations, but it does say something to those in geology, drilling, and industry who don’t yet have an imagination for what they can do to help the world.