370
360
350-
340
in parts per million
330
320
310
300
290
atmospheric CO₂ concentration
1860
1880
1900
1920
1940
year
1960
1980
2000
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)
Increased agriculture and farm animal reproduction
• Combustion of fossil fuels by humans
Deforestation by humans
Glaciers melting and causing ocean acidification370
360
350-
340
in parts per million
330
320
310
300
290
atmospheric CO₂ concentration
1860
1880
1900
1920
1940
year
1960
1980
2000
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)
Increased agriculture and farm animal reproduction
• Combustion of fossil fuels by humans
Deforestation by humans
Glaciers melting and causing ocean acidification