Yes, they do, to a limited extent.
The white top of clouds will reflect much of the sun's ray back into space.
Particles in the clouds reflect light in all directions
albedo
Clouds are part of the weather process. The driving factor is not the clouds but the heat from the Sun. This said however, clouds are reflective and when these is a dense cloud cover less solar radiation hits the planets surface. They also tend to act like a blanket and reflect back any heat that the Earth is radiating.
The clouds play a role similar to the ozone layer. Ultra violet radiation coming from the sun strikes the clouds and the ozone layer and is repelled back into space allowing only "safe" light waves to hit the Earth. The ground absorbs heat, and then releases it. The rising heat reaches the clouds and is reflected back down to the Earth.
no
Clouds can reflect some light back to space depending on the water content in the clouds. The water causes a prism which reflects light back into space.
Clouds can reflect some light back to space depending on the water content in the clouds. The water causes a prism which reflects light back into space.
The white top of clouds will reflect much of the sun's ray back into space.
The white top of clouds will reflect much of the sun's ray back into space.
Particles in the clouds reflect light in all directions