I wish I would have known. I would have invited them to come and heat my yard.
Heaters outside? for how long?
They wasted fuel. They contributed to global warming.
This passes for science?
I read this study that artificially heating 5 sites for 23 years has no effect on its local environment when compared to naturally warmed sites.
The results are exactly the same.
The same result happened when I was involved in an Acid Rain study in MN 35 years ago. We planted acid sensitive plants downwind of a coal burning plant. There was no change in the plants vs not downwind of the coal burning plant.
The study was never made public (for some reason)