the greenhouse effect is process by radiation from the sun, when the heat radiate to the Earth 6% scattered from atmosphere, 19% absorbed by atmosphere and clouds, 20% scattered and reflected by clouds and last the most 51% absorbed by the Earth that make the Earth is warmed.
Greenhouse gases in atmosphere trap and effect heat may increase by human, pollution also that a result of the Earth becomes warmer. in the same way heat make comfortable for life but heat must suitable.