"Peter Dohm" wrote in message
.. .

Obviously, for the heat to traverse the interplanetary space, we are
burning
*way* too much fuel!

OTOH, there seems to be some doubt whether the Earth's northern polar
region
is currently as warm as it was in Viking times.


Some doubt? The Vikings planted crops, including vineyards, in Greenland,
which unless you missed it, is completed covered in permanent ice.