New plants can always be grown using sunlight and water. Unless there is a supernova, we won't run out of sunlight, and water is continually recycled.
By plants and planktonMost of the Earth's oxygen is produced by plants, both on surface and under water. Algae.
bacteria.
coal
Bacteria
===========================
Specifically a particular type of bacteria that live in nodules on the roots of certain plants (eg the Legume family) called "Nitrogen Fixing Bacteria" .
Not other bacteria decompose organic material and release nitrogen back into the atmosphere.
Oil
United States and China
Water treatment plant
carbon footprint
Use more coal to make electricity(apex)
Natural recycled water
hurricanes and other extreme weather will increase
cellular respiration
A citric acid is added to the solution but the pH of the solution does not change