Space.com: Earth in Human Hands: Q&A with Astrobiologist David Grinspoon
„I think that an advanced planetary civilization will modify their own planets to be more stable, to prevent asteroid impacts and dangerous climate fluctuations. I think we can look for engineered planets. I think that if we’re around in 10 or 20,000 or 100,000 years, we will be engineering Earth. I think that when society gets planet-changing technology, it will either not last long because it can’t handle that, or it will become able to manage themselves and their planet. Truly advanced civilizations, their planets will potentially be recognizable as planets that have been altered purposefully. We could start looking for technosignatures.“