> You run maybe a pint of bar and chain oil through a big felling saw in an entire day of running it.
Without getting into whether it's actually a significant pollutant compared to other sources, I think your estimate is considerably low. I'm usually worn out before I can cut for a whole day, but I've gone through more than 2 quarts in a day. And here's someone professional who says he goes through a gallon a day of bar and chain oil with a similarly sized saw (possibly because he's able to keep going longer): https://forestryforum.com/board/index.php?topic=46008.msg662...
Without getting into whether it's actually a significant pollutant compared to other sources, I think your estimate is considerably low. I'm usually worn out before I can cut for a whole day, but I've gone through more than 2 quarts in a day. And here's someone professional who says he goes through a gallon a day of bar and chain oil with a similarly sized saw (possibly because he's able to keep going longer): https://forestryforum.com/board/index.php?topic=46008.msg662...