Meliorism

 "An old truism holds that the pessimist sees the glass as half-empty while the optimist sees it as half-full. But active and engaged people don't bother to measure the contents of their cups. They savor what they've got, drink it down, then go looking for a refill. One name for this approach is meliorism. Meliorists want to make things better—to ameliorate them." — Andrew Fiala, The Fresno (California) Bee, 10 Nov. 2017