Question

what is the green house effects?

Answer 1

t refers to circumstances where the short wavelengths of visible light from the sun pass through a transparent medium and are absorbed, but the longer wavelengths of the infrared re-radiation from the heated objects are unable to pass through that medium. The trapping of the long wavelength radiation leads to more heating and a higher resultant temperature.

Answer 2

well the effects are :
global warming
melting of glaciers
inundation of coastal areas