Whether one blames this environmental disgrace on buyers or manufacturers or rental companies or whatever, it has been willful denial for decades that has delayed the development of a clean engine. Those owners and companies have been very happy to make big profits on a growing industry without any investment in stewardship or responsible modernization.
"The Clean Snowmobile Challenge" was started in the late ’90s, when industry people claimed a clean alternative was not practical. In the very first year, a small team of college kids made the winning snowmobile with a clean-burning four-cycle engine. The industry would rather spend money on ads, and the owners would rather spend money on $30,000-dollar SUVs to tow their custom trailers and store their electrically heated snowsuits.
The popular snowmobile sport of "high marking" is an exact analogy of what has gone on in the industry: Pick an avalanche chute and try to see how far up the steep slope one can roar with the machine. Flatlanders will surely feel aghast to see what happens when an avalanche lets loose, but anyone paying attention has to know: A lot of obviously poor choices went into the disaster.