Refer to the figure.
The figure shows the temperature (in °C, relative to modern temperature) and the concentrations of carbon dioxide (in ppm) and methane (in ppb) over the past 400,000 years.
-Relative to the average over the last 400,000 years, concentrations of CO₂ during the warm interglacial periods in this time period have been _______, and concentrations of methane have been _______.

Question

Refer to the figure.

The figure shows the temperature (in °C, relative to modern temperature) and the concentrations of carbon dioxide (in ppm) and methane (in ppb) over the past 400,000 years.
-Relative to the average over the last 400,000 years, concentrations of CO₂ during the warm interglacial periods in this time period have been _______, and concentrations of methane have been _______.

Quizplus · Accepted Answer

During warm interglacial periods over the last 400,000 years, both CO2 and methane concentrations have been relatively high compared to glacial periods.

Refer to the Figure