I am curious as to whether humans’ activities in increasing the carbon dioxide levels in the atmosphere now will have an effect in the far future of Earth. Specifically, as I understand it, in 600 million years or so the increasing output of the Sun will cause carbon dioxide to be absorbed by the rocks that make up the Earth’s crust at a faster rate than it is now, and that this will make it impossible for trees (first) and other plants (eventually) to perform photosynthesis, leading to the extinction of plants, which will also obviously lead to the extinction of most other life at that point.
Is this so far in the future that nothing we do now will still be a factor by that point, or have we maybe added a few million years on the inevitable demise of all life on Earth by increasing the available atmospheric CO2? Just for the record, I understand that this is the most ancillary of all possible benefits and that the consequences for human civilization in the near term are potentially dire.