I explain it using clouds. Most people know that a clear sky at night means it cools off a lot more than when there are clouds. The effect of CO2 in the atmosp

I explain it using clouds. Most people know that a clear sky at night means it cools off a lot more than when there are clouds. The effect of CO2 in the atmosphere is less than that, but it's always there. The amount can be measured with CO2 meters, and it's going up. You just don't see the cloud because CO2 is transparent.