"when I came home at night, I’d know that I had literally spent my day trying to cure cancer or prevent global warming" Someone can have a very large influence

"when I came home at night, I’d know that I had literally spent my day trying to cure cancer or prevent global warming" Someone can have a very large influence on the world if they make enough money (by doing anything) and then spend that money to empower others to "cure cancer or prevent global warming".