Growth in world population and increasingly scarce resources drive informed expectations for the future. The most dire predictions derive from a failure to moderate the widening disparity in wealth. Other factors--disease, war, state collapse, ... are generally unpredictable and make extrapolation almost impossible.

This is just one of the scenarios given in A Synopsis: Limits to Growth: The 30-Year Update - The Donella Meadows Institute This is an update of the Famous Club of Rome forecasts which in hindsight were a bit pessimistic. These are the most recognized Futurologists.

Noam Chomsky is no lightweight. His outlook is depressingly stark.
The End of History?

No lightweight either, the World Economic Forum offered their prediction of the hazards that lie ahead:
Top 10 global risks 2015

No summary of dire forecasts would be complete without mentioning the Handy Model Human and nature dynamics (HANDY): Modeling inequality and use of resources in the collapse or sustainability of societies