What are my oppertunities to make a LARGE scale difference in a third world country? What field to i enter?

Question

What are my oppertunities to make a LARGE scale difference in a third world country? What field to i enter?

Answer 1

The production of wind or solar energy that the local population could build for power.

The population could be put to work building thousands of lakes all over the country supplying vast amounts of water for corp growth.

Answer 2

politics or the military