To calculate further: we have 0.038% CO2 in the air. Nature itself produces about 96% of it. The rest, 4%, is man-made. That's 4% of 0.038%, which is

To calculate further: we have 0.038% CO2 in the air. Nature itself produces about 96% of it. The rest, 4%, is man-made. That's 4% of 0.038%, which is