Vezano uz ledena doba tu ima jaaako puno faktora koji igraju ulogu
http://en.wikipedia.org/wiki/Ice_age

Dati ću mali ekstrakt sa šugave wikipedije
"The causes of ice ages are not fully understood for both the large-scale ice age periods and the smaller ebb and flow of glacial–interglacial periods within an ice age. The consensus is that several factors are important: atmospheric composition (the concentrations of carbon dioxide, methane); changes in the Earth's orbit around the Sun known as Milankovitch cycles (and possibly the Sun's orbit around the galaxy); the motion of tectonic plates resulting in changes in the relative location and amount of continental and oceanic crust on the Earth's surface, which affect wind and ocean currents; variations in solar output; the orbital dynamics of the Earth-Moon system; and the impact of relatively large meteorites, and volcanism including eruptions of supervolcanoes."

Ono što me nastavlja fascinirati je koliko se jednostavnih objašnjenja plasira u medije vezano uz globalno zagrijavanje. A takve stvari nikad nisu produkt samo nekoliko stvari, već ima jako puno faktora koji utječu.

Koji god relevantni chart pogledaš vidiš da postoje generalna opća kretanja kod recimo temperatura, ali isto tako da imaš velike oscilacije na koje su svakakve stvari utjecale. Od sunca, vulkana...
Od
http://en.wikipedia.org/wiki/Medieval_Warm_Period
do
http://en.wikipedia.org/wiki/Little_Ice_Age

Isto kao još veći mikro utjecaji koje sam spomenuo kao što su
http://en.wikipedia.org/wiki/Mount_Tambora
http://en.wikipedia.org/wiki/Year_Without_a_Summer

A o ovim nekakvim oscilacijama koje neki spominju npr:
Neću ni komentirati.

A vezano uz
Ovdje ću samo još jednom ponoviti
http://en.wikipedia.org/wiki/Populat...tleneck#Humans
http://en.wikipedia.org/wiki/Lake_Toba
http://en.wikipedia.org/wiki/Supervolcano#VEI_8