Question

When analyzing the ice core, scientists discovered that the carbon dioxide (CO2) levels in the atmosphere were much lower than they are now. Since CO2 is a greenhouse gas, what does the lower CO2 level in the past say about our current climate?

Answer 1

Since CO₂ is a greenhouse gas hence it can trap the heat of sun's ray.

since the level of CO₂ in the past were low so the climate was cooler in the past. Now since the CO₂ levels are very high so it traps more heat thus raising the temperature of atmosphere more and more. This causes the melting of ice cores thus increasing the sea levels.