Perhaps aviation biggest challenge....

[Ian W]

Just some science for those that are interested.
The Earth is currently in an ice-age and we are in the Holocene interglacial (warm ) period in that ice age. You will note from the diagram below that over geologic timescales there is no causal relationship between levels of CO2 and the global temperatures. Indeed on all timescales atmospheric CO2 levels lag temperature changes, indicating that when the seas are warmer they out-gas CO2 and when it is colder more CO2 dissolves in the oceans. You should also note that there is a level of 'homeostasis' in geologic time showing that temperatures tend to stop their rise and not 'run away'.. This is almost certainly due to the hydrologic cycle.

You should also note that the Holocene was much warmer 10,000 years ago than it is now at the Holocene Climatic Optimum, it was also warmer at the Minoan Climate optimum, 1400 years or so later at the Roman Optimum and 1400 years or so later at the Medieval Warm Period. Despite the recent warming out of the Litttle Ice Age we are at the cold end of the Holocene Interglacial



CO2 vs Temperatures over geologic timescales

The amount of energy in the tropical cyclones (including hurricanes) can be measured precisely these days here is a graphic from Ryan Maue. As the text says - despite the mainstream media claims the number and strength of tropical cyclones is not increasing.

Accumulated Cyclone Energy last few decades

Finally many of the graphs shown have their Y-axis hugely distorted so changes of hundredths of a degree C seem huge. This is spurious accuracy as the comparator periods a hundred years ago did not have the sensors we have today. There were almost no sensors in the Southern Indian Ocean or in the South Pacific and continents such as Africa had very few yet the figures showing changes from past guessed temperatures are to hundredths of a degree. The graphics are themselves misleading by vastly increasing the scale of the Y axis making hundredth of degree changes look extreme. So the graphic below takes the NASA GISS dataset and displays the temperatures as if they were shown on a row of red alcohol thermometers. Does it seem that there are changes to panic about?


Show temperatures on red alcohol thermometers

For the technical averaging an intensive variable like atmospheric temperature is a nonsense. You can average the figures of course and do it to as many places of decimals as you wish in the same way you can average the phone numbers in the London Phone book to several places of decimals but an average phone number is equally meaningless.

The correct metric for assessing the 'retention of heat energy' in the atmosphere is Kilojoules per Kilogram as the enthalpy of the atmosphere varies dependent on relative humidity. You should ask why Climate 'scientists' are using the incorrect measure for atmospheric energy content. The answer is similar to why they expand the Y-Axis on their graphs.