It's not a question "if", it's the question "when" something will collapse! What will come to an end first: overpopulation, economic collapse, shortage of crude oil, unpolluted air, uncontaminated land, pure water, natural resources, etc? However, something eventually will come to an end. Another danger is when some country or terrorist groups will use the atomic bomb. The global warming is already occurring, what consequences it will bring is anybody's guess!