Question 07 Over the last 600,00 years, atmospheric CO2 levels have never gone a
ID: 298373 • Letter: Q
Question
Question 07
Over the last 600,00 years, atmospheric CO2 levels have never gone above ______ ppm. However, during the last 150 years, CO2 levels have drastically ______ to a present day level approaching _____ ppm.
100; decreased; 300
300; decreased; 400
100; increased; 300
300; increased; 400
Hey, wait! Atmospheric CO2 leveles have been steady at roughly 300 ppm for the last 600,000 years, and are still at that level today.
100; decreased; 300
300; decreased; 400
100; increased; 300
300; increased; 400
Hey, wait! Atmospheric CO2 leveles have been steady at roughly 300 ppm for the last 600,000 years, and are still at that level today.
Explanation / Answer
Over the last 600,00 years, atmospheric CO2 levels have never gone above 300 ppm. However, during the last 150 years, CO2 levels have drastically increased to a present day level approaching 400 ppm.