Long Term Plans for Planet Earth:
50,000 years from now - The current interglacial period ends sending the Earth back into a glacial period of the current ice age, regardless of the effects of anthropogenic global warming.
800 million years from now - Carbon dioxide levels fall to the point at which C4 photosynthesis is no longer possible. Free oxygen and ozone disappear from the atmosphere. Multicellular life dies out.

Timeline of the far future - Wikipedia