The specific gravity of carbon dioxide is 1.52 relative to dry air, and is the same weight as propane. It is even heavier in relation to our humid atmosphere, ranging around 1.61. It falls through the atmosphere about like a cotton seed. Wind can blow it upward, but it falls right back down. It acts like rainwater, seeking low points. We do not need to build pipelines to inject it into the ground. It sinks into to the ground all by itself.
Photosynthesis (CO2 + Sunlight + H2O) cannot exist without carbon dioxide. Photosynthesis uses sunlight to transform carbon dioxide into glucose and other organic compounds that make plants and it transforms water into oxygen which is exuded.
We breathe in oxygen and exhale carbon dioxide. Plants absorb carbon dioxide and give us oxygen. As Patick Moore (co-founder of Greenpeace) has pointed out for over ten years, carbon dioxide is critical to the life cycle of the plant and animal kingdoms. He has referenced analysis that indicates nearly triple the carbon dioxide content in our atmosphere would be more ideal for plant life. He is correct.
Hellbound and Down 