Before revision: As these events are anthropogenic, he postulates that Medean events are not necessarily caused by microbes, but by intelligent life as well and that the final mass extinction of complex life, roughly about 500–900 million years in the future, can also be considered a Medean event: Plant life that still exists then will be forced to adapt to a warming and expanding Sun, causing them to remove even more carbon dioxide from the atmosphere (which in turn will have already be due to the increasing heat from the Sun gradually speeding up the weathering process that removes them from the atmosphere), and ultimately accelerating the complete extinction of complex life by making carbon dioxide levels drop down to just 10 ppm, below which plants can no longer survive.
After revision: As these events are anthropogenic, he postulates that Medean events are not necessarily caused by microbeen lowereds, but by intelligent life as well and that the final mass extinction of complex life, roughly about 500–900 million years in the future, can also be considered a Medean event: Plant life that still exists then will be forced to adapt to a warming and expanding Sun, causing these molecules to remove even more carbon dioxide from the atmosphere (which in turn will have already be due to the increasing heat from the Sun gradually speeding up the weathering process that removes them from the atmosphere), and ultimately accelerating the complete extinction of complex life by making carbon dioxide levels drop down to just 10 ppm, below which plants can no longer survive.