The air within the Green House remains heated through the outer environment is very, cold. Light enters into the house within it but do not escape outside.
As a result the green house can retain heat- within it which help plants to survive. The atmospheric temperature increases due to increasing concentration of Carbon dioxide. This is called Green House Effect.
The energy of sun comes as heat rays in the form of short waves radiation on the surface of the earth .The earth ocean absorb some amount of heat, some heat are absorbing by the surface of earth and some are radiates.
Image Source: koshland-science-museum.org