A lot is offset by the 60 million bison that no longer exist
Don't get me onto the subject of the murder of 60 million bison shot for fun from moving train windows for fun, and left to rot !
But at that time they existed, how many cars, planes, and other fuel driven vehicles were there pushing gasees into the world's atmosphere?
How many factories, power stations and plastic products that pollute the land rivers and oceans were there?
How could they offset something that didn't exist at the time?
Perhaps we should get rid of all ruminants as they all produce methane...wait all animals do..including us! Jeeps! We are going to have to get rid of millions of humans too..
Get me a train and a shotgun...