Okay, I'll bite. Why does the earth's precession cause
global warming?
Go to the links which Larry Wolfe gave and look at ~Orbits.
Some destitute person there shows a temperature rise of some 2o due to
atmospheric mismanagement., but the rise from <30o to some 60o due to
precession since the last glaciation is not shown . Nor does it show the
temperature rise at various locations. I don't know the temperature of the
ice in New York but I suspect it was chilly. And I don't know if the
temperature max of the previous cycle is known. But the recent rise of ~2o
seems trivial by comparison.