The estimator/estimator requires the device's browser to have Flash Shockwave capabilities (correct plug-in needs to be installed - most desktop and laptop browsers will be able to handle Shockwave and most tablets and smartphones may likely not).
To use the calculator/estimator: Simply input new data in the yellow boxes. Tab to the yellow box (or place cursor in yellow box) that will have new information; highlight (select) the existing entry then type in the new data; and then press the Enter/Return key.
To reset the calculator/estimator to default values and start fresh, click the browser refresh button or click on the 'Reset' button at bottom of calculator.
During 1988 Congressional testimony, NASA's James Hansen publicly shared his climate model's simulation predictions that stretched out to 2020AD.
His prediction for the global temperature increase for the period of 1960 to 2012 was an approximate +1.17°C. The actual increase was only +0.50°C.
For the exact same time period, the above very simple estimator tool produced a result of +0.45°C - significantly closer to actual reality than the multi-billion dollar climate model used by NASA.