On a longer time horizon, we need to figure out how to conduct astronomy without holding large regions (countryside, LEO, etc.) as test articles to control. Constellations like Starlink have already blown through that roadblock and rather than backlash we now see various governments / firms following them. LEO will only become more crowded.
In a more extreme case we have planetary protection where entire celestial bodies like Mars should remain sterile to preserve the possibility of their further study. It is easy to advance that policy while those bodies remain remote, but if we obtain the capability to develop the inner solar system then, much like LEO, we will do it regardless of the difficulty it imposes on xenobiologists.
The best solution is to reduce the global population. Don't call me crazy. It's already happening in almost all developed countries. It's reasonable to predict that the remaining countries will follow in like 50 years. With a decline of population, the places that need to be lit up would also gradually reduce. More space for nature, for astronomy, for everything.
In a more extreme case we have planetary protection where entire celestial bodies like Mars should remain sterile to preserve the possibility of their further study. It is easy to advance that policy while those bodies remain remote, but if we obtain the capability to develop the inner solar system then, much like LEO, we will do it regardless of the difficulty it imposes on xenobiologists.