In a Billion Years, Life Will Die When Carbon Dioxide Is Depleted?

It's freaking hard to imagine this, but it's interesting and I never heard this before:

In billion-year timescales, it is predicted that plant, and therefore animal, life on land will die off altogether, since by that time most of the remaining carbon in the atmosphere will be sequestered underground, and natural releases of CO
2 by radioactivity-driven tectonic activity will have continued to slow down.^[26] The loss of plant life would also result in the eventual loss of oxygen. Some microbes are capable of photosynthesis at concentrations of CO
2 of a few parts per million and so the last life forms would probably disappear finally due to the rising temperatures and loss of the atmosphere when the sun becomes a red giant some four-billion years from now.^[27]

This is from the Wiki article "Carbon dioxide in Earth's atmosphere", which is actually pretty interesting.