Question

What percentage of co2 in the atmosphere is man made?

Answer 1

In percent is is about 3-4 percent .Human activities—mostly burning of coal and other fossil fuels, but also cement production, deforestation and other landscape changes—emitted roughly 40 billion metric tons of carbon dioxide in 2015

Answer 2

Answer:

So 0.03% of the earths atmosphere is CO2 (the big global warmer). Of which between 2-4% of that is caused by humans. So humans are responsible for 0.0009% of CO2!