What is the energy efficiency paradox?

The observation that energy conservation investments can pay for themselves through lower energy costs and help the environment, but few people show interest in making conservation investments.

The observation that energy conservation investments can save money but are horrible for the environment.

The observation that energy conservation investments will increase energy costs but will help to save the environment.

The observation that rich people can make the biggest contributions to lowering overall energy use, but most energy conservation investments are made by poor people.

The observation that combined heat and power (CHP) systems appear to violate theoretical efficiency limits for combustion engines.