The vent began millions of years ago in what is now Idaho, and as that part of the surface of North America rotated WSW, the vent remained open spewing the environmentally-friendly gas CO2 into the atmosphere from it's origin in Idaho to Wyoming, it's present site.
When the flow of heat energy in the heat pipe, is less than the conductive loss of heat energy to the country rock, the heat vent at the surface will cool, heal and become quiescent.
Then the trees, brush, grass, etc. will have to find another source for life-giving Carbon.
With only 337 parts per million CO2 in our atmosphere, there needs to be more Yellowstone Heat vents to boost the life-giving supply of CO2.
CO2 is a rare gas with a very short lifespan.