Question

As you may know, the causes of global warming and climate change are debated in scientific circles. Some say greenhouse gases are to blame; others say the earth regularly experiences cycles of warming and cooling. Some point to our recent record cold temperatures and snowfall, and ask how can we blame global warming? Still other scientists are predicting that our present global warming trend will result in a new Ice Age.

Try to locate the physics principle(s) which provide a logical progression from warmer temperatures to an Ice Age. You don't have to believe the theory, just merely repeat it here and discuss its merits or deniability.