Cycles
Excellent article, producing increasing references to discuss climate changes with more information and less passion.
I am undergoing a PhD in Energy and Environment, not buying as-is the discussions about global heat and increase in CO2 emissions as sold since the end of last century. Environmental discussions rarely include a 10-20 millennia data about variations of temperature, ice cap areas, volume of CO2, the effects of the Mylankovitch cycles, volcano activity etc., resuming the discussions about the effects of hydrocarbons in the climate. Also, the levels of energy per capita should be included in the discussions, as it grows more than the population increase. The world, in a century of two, will use the hydrocarbons until the last coal piece has been burnt, and Nature will do its part independent of mankind.