Any idea what is optimal temperature for the earth? What processes and factors that control the earth’s temperature (http://www.universetoday.com/55043/earths-temperature/) and how it comes that the normal temperature of the human body (https://en.m.wikipedia.org/wiki/Human_body_temperature) is established: oral (under the tongue): 36.8±0.4 °C (98.2±0.72 °F), internal (rectal, vaginal): 37.0 °C (98.6 °F)?

To know the answer check the previous websites and the following as well. They can give you some answers and then you can navigate yourself in the web to know more: https://www.quora.com/What-is-the-optimal-temperature-for-the-Earth