A biological approach
"Scrunched down in the seats
of my frozen car,
I told you with smoking breath
how I wanted to piss on the windshield,
both relieving myself
and clearing visibility
in one masterful stroke.
...And there while the engine warmed
and your your head bobbed
in and out of your coat,
we made some sense of winter.''
-- From ''Winter,'' by D.W. Donzella