Thus according to these calculations we are adding

Question

How much does the atmosphere weigh over each square kilometer (km²)?  Recall that 10⁶ m²  =  1 km².

Thus according to these calculations, we are adding CO₂   to the atmosphere at the rate of approximately Answer: __________ percent per year.  At this rate, can we account for the observed increase in CO₂   in the atmosphere since 1950s?  CO₂  content in 1959 was measured at 316 ppm (parts per million) and was 380 ppm in 2005.  What is the percentage increase in CO₂   over this forty-six-year interval.