Is Man-Made CO2 Bad for the Earth?
When God created man on the 6th day, the atmosphere had just the right amount of all gases including C02. God created the carbon cycle such that when living things die, their carbon returns to the atmosphere as CO2.
Each individual man lived for almost 1,000 years until the flood. Then man's lifespan went gradually down until near the end of Moses' life, when man's lifespan was 70-80 years. There it has remained until recently.