Joseph Tainter taught us in 1988 that civilizations have a limited lifespan due to the marginal returns on investments declining over time. This can be regarded as a theoretical issue that has relevance for archaeologists, but ever since Jem Bendell wrote his paper on deep adaptation in 2018, I wonder whether we as conservationists and specialists in sustainable development should also consider this in how we approach our discipline and what kind of research questions we should address if our civilization is indeed already in decline ?