Actually there is plenty of evidence of societies suffering greatly when they exceeded their resources, including modern ones like during the Rwandan genocide.

Actually there is plenty of evidence of societies suffering greatly when they exceeded their resources, including modern ones like during the Rwandan genocide. We can also observe the current global fall, in terms of fast declining ocean fish stocks, fast depleting aquifers, and tons of other measurements. The book Collapse: How Societies Choose to Fail or Succeed is a layman's introduction, with references to extensive scientific evidence in its appendix. The relevance of the evidence is always debatable but to say there is none or that such failure hasn't been observed, or even that a fall cannot now be seen in progress, is false.