:: Moreover, I find in the paleoclimatology article no reference to a Roman Warm Period and then the following simplistic assertion: Short term (104 to 106 years): Geologically short-term (<120,000 year) temperatures are believed to be driven by orbital factors (see Milankovitch cycles) amplified by changes in greenhouse gases. The arrangements of land masses on the Earth's surface are believed to influence the effectiveness of these orbital forcing effects. This is a gross dumbing down of the truth that borders on deliberate disinformation. We would not, for instance, find such a simplistic picture presented at RealClimate. The little ice age for instance is thought to be correlated with reduced sunspot activity. The Little Ice Age is not thought to be caused by changes in greenhouse gases. I would really like to know what is going on here.