Weather or climate? It pays to know the difference before we slaughter our economy on the climate alarm altar.
"Weather" describes atmospheric conditions at any location – temperature, humidity, clouds precipitation and winds. Every place has its own weather which depends on the time of day, the season, the latitude, local topography and the surface temperature of the nearest ocean.
Meteorologists need a good knowledge of weather records, atmospheric physics, geography, oceanography and solar cycles. Weather is mainly about wind – is it hot or cold, moist or dry, strong or weak? Surface atmospheric pressure gradients control wind strength, direction and temperature, and are valuable tools for short-term forecasting. Longer-term weather forecasters will find value in studying sun spots and El Nino episodes in the oceans. Few weather-men see any value in measuring or forecasting atmospheric CO2 to help forecast the weather.
"Climate" is defined as the thirty year average of weather at that spot. One week of bad weather is not evidence of climate change, no matter how often the ABC claims that. And adding the word "Climatology" to the name of the Bureau of Meteorology does not magically convert weather men into climatologists.
To determine climate trends requires centuries of reliable weather records. This is why geologists feature so prominently in determining past climates by mapping earth's crust and collecting deep core samples in ice sheets, ocean and lake sediments and crustal rocks. (And it explains why climate alarmists alter past temperature records to create spurious warming trends.)
A canny and persistent mathematician/engineer Milutin Milankovitch was one of the first to suggest that changes in various solar cycle orbits and axial tilts cause changes in Earth's climate. He spent years carefully calculating (by hand) how such changes caused changes in solar heat received by the Northern Hemisphere landmass. He speculated that this caused the advance and retreat of the great northern ice sheets. Since then dozens of geologists, palynologists, astronomers and engineers have confirmed the reality of the Milankovitch cycles.
'Models" provide the comedy act in the climate circus. Using taxpayer funds and massive computers they build super-complex models designed to prove that global temperature will rise dangerously because of human production of carbon dioxide. These models supposedly prove that the world faces an unprecedented episode of imminent and irreversible global heating.
Climate models have three features.
Firstly, they assume that carbon dioxide in the atmosphere is driven by human activity, and that CO2 drives global temperature. They calmly ignore the moderating effects of oceans, the unmeasured effects of volcanoes and the declining effects of extra CO2.
Secondly, they try to write formulae for the myriad of factors that drive the weather. Then these computers spit out their estimates for "average global temperature" – a bureaucratic invention - nothing lives or grows in "average global temperature".
Thirdly, these models have only one valuable feature – they are known to be consistently wrong.
The assumptions are suspect, the relationships are far more complex than the models assume, and their scary forecasts are worthless. (see results below).
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