Question

which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide? neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide, both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide, only methane is a more effective greenhouse gases than carbon dioxide, only nitrous oxide is a more effective greenhouse gas than carbon dioxide

Answer 1

Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.

Briefly: on a per‑molecule (or per‑mass) basis their global warming potentials are much higher than CO2 (GWP100 ≈ 28–34 for CH4 and ≈ 265–298 for N2O, per IPCC assessments). However CO2 remains the dominant driver of long‑term warming because of its much larger emissions and long atmospheric lifetime.