The Greenhouse Effect Practice Test

Rising CO$_2$ and CH$_4$ increase Earth’s reflectivity, so the surface warms to compensate for reduced absorbed sunlight.

Rising CO$_2$ and CH$_4$ increase convection so strongly that heat escapes to space faster, which directly causes warming near the surface.

Rising CO$_2$ and CH$_4$ primarily destroy stratospheric ozone, allowing more ultraviolet radiation to reach the surface and causing the observed warming.

Rising CO$_2$ and CH$_4$ increase absorption of outgoing infrared radiation, raising the altitude from which Earth effectively radiates to space and leading to surface warming until energy balance is restored.