Most courses (I'd say more than 90%) that are being built today in Europe are improving nature. The reason is simple: you don't get planning permission otherwise. The sites available for new golf courses are bulldozed farmland, industrial properties, waste dumps etc.
Budersand, our new German links course, was an airport! The reclamation of the dunesland most certainly improved nature over the steel and concrete based landscape that was there before.
Trump Scotland is an anomaly in that he got permission to build a golf course in pristine dunesland. That would be impossible in most other countries. I am not overly familiar with the rest of his portfolio, but would almost wager a bet that he improved nature on most of his courses even without trying very hard.
Ulrich