Image showing exchanges of infrared radiation involving the Earth’ surface and its atmosphere. These exchanges are represented by arrows, whose width indicates approximately the rate of energy transfer. The image shows an narrow upward pointing arrow labelled ‘convection and latent heat’. This arrow, which originates from the Earth’s surface, points towards the atmosphere. A wider downward pointing arrow, labelled ‘atmospheric infrared radiation absorbed by surface’, is directed towards the Earth surface. Another wide upward pointing arrow, originating from the Earth’s surface is labelled ‘infrared radiation emitted by surface’. Two upward pointing arrows originate from this. One is a wide arrow labelled ‘surface infrared radiation escaping to space’. The other is a narrow arrow labelled ‘surface infrared radiation absorbed by atmosphere’. Finally, the image shows an upward pointing arrow labelled ‘atmospheric infrared radiation escaping into the space’.