Int. J. Environ. Res. Public Health 2011, 8 1000 1. The atmospheric response times for volcanic sequences would be longer than they would be without the UN‘s high positive feedback hypothesis. 2. There is a tropical hot spot in the upper troposphere. 3. There is a heating of the oceans. 4. Observed outgoing radiation fluxes from the earth decrease with increases in sea surface temperatures. Each of these tests will be discussed in turn, with those depending on the most recent data discussed last. 2.3.1.1. The Atmospheric Response Times for Volcanic Sequences Would Be Longer than They Would Be without the UN‘s Strong Positive Feedback Hypothesis If climate sensitivity is as high as the UN claims, it should show up in the atmosphere‘s response time to volcanic eruptions. The reason for this is that climate sensitivity is also a measure of how tightly air and sea temperatures are coupled. High sensitivity is associated with weak coupling, allowing the establishment of significant disequilibration of the sea surface temperature. To quote Lindzen‘s Slide 45 [22]: ―Another line of inquiry involved noting that the time for the ocean to respond to a change in forcing increased as climate sensitivity increases. This may seem counter-intuitive, but the idea is simple. Sensitivity is essentially a ratio of a change in temperature to a change in energy flux. High sensitivity means that a change in temperature is accompanied by a small change in flux. However, a small flux takes longer to change the temperature of the ocean. In any event in papers published in 1994 and 1998, we noted that in sensitive climates, a sequence of volcanoes would lead to a secular cooling, but in an insensitive climate, the volcanoes would simply produce transient 1–2 year dips in temperature. The record seems to favor the dips.‖ Lindzen provides two references: [23,24]. A 1997 presentation [25] he made at a US National Academy of Sciences symposium clarifies this argument as follows with regard to the volcanic sequence between Krakatoa in 1883 and Katmai in 1912: ―The results show that for sensitive climates (>0.6 °C for a doubling of CO2), each volcano builds on the residual base of earlier volcanoes leading to a substantial long-term cooling (~0.5 °C cooling between 1883 and 1912). For low sensitivity, the response consists in essentially independent ‗blips.‘ The observed temperature record certainly shows nothing more than isolated ‗blips.‘‖ 2.3.1.2. There Is a Tropical Hot Spot in the Upper Troposphere According to Chapter 9 of the IPCC AR4 report [26] all the IPCC climate models predict that there should be a hot spot in the upper troposphere about 5–12 km above the Earth‘s surface in the tropics caused by increased evaporation from warmer oceans leading to the accumulation of higher concentrations of water vapor in the upper troposphere, and thereby generating the critical positive