The Photosynthesis cycle ... we humans and the animales breathe oxygen and emit carbon dioxide. The plants take up carbon dioxide and restitute oxygen... It's been in perfect balance for billions of years... even before man came on the scene.

The Photosynthesis cycle … we humans and the animals breathe oxygen and emit carbon dioxide. The plants take up carbon dioxide and restitute oxygen… It’s been in perfect balance for billions of years… even before man came on the scene.