What do you think of this? http://www.google.com.au/url?sa=t&s...99TtAg&usg=AFQjCNHu6QfBeGZOdqYDhNhsgPzz264wmQ The shortwave changes are larger than the longwave changes and results in a positive decadal net radiation changes in most latitude zone between 60oS and 40oN. The net radiation changes are negative for latitude zones between 40oN and 60oN. For the tropics at a whole, the longwave radiation has increased by 1.6 Wm-2, the shortwave radiation has decreased by 3.0 Wm-2, and the net radiation has increased by 1.4 Wm-2 between late 80s’ and the mid 90’s. For the near global mean, the changes are slightly smaller. The longwave radiation has increased by 1.3 Wm-2, the shortwave radiation has decreased by 2.1 Wm-2, and the net radiation has increased by 0.7 Wm-2 during the same two periods http://www.physicalgeography.net/fundamentals/7i.html Shortwave radiation from the Sun enters the surface-atmosphere system of the Earth and is ultimately returned to space as longwave radiation (because the Earth is cooler than the Sun). A basic necessity of this energy interchange is that incoming solar insolation and outgoing radiation be equal in quantity. One way of modeling this balance in energy exchange is described graphically with the use of the following two cascade diagrams.