year
Based on the above graph, the concentration of Carbon Dioxide in our atmosphere began to increase exponentially around 1860.
Today, CO2 is at the highest concentration is has ever been. What do scientists attribute this exponential increase around the 1860s to?
(1 point)
Glaciers melting and causing ocean acidification
Combustion of fossil fuels by humans
Increased agriculture and farm animal reproduction
Deforestation by humans