This is demonstrated clearly in this video.
Scientists at two of the world’s leading climate centres – NASA and NOAA – have been caught out manipulating temperature data to overstate the extent of the 20th century “global warming”.The evidence of their tinkering can clearly be seen at Real Science, where blogger Steven Goddard has posted a series of graphs which show “climate change” before and after the adjustments.
When the raw data is used, there is little if any evidence of global warming and some evidence of global cooling. However, once the data has been adjusted – ie fabricated by computer models – 20th century ‘global warming’ suddenly looks much more dramatic.
This is especially noticeable on the US temperature records. Before 2000, it was generally accepted – even by climate activists like NASA’s James Hansen – that the hottest decade in the US was the 1930s.
The basic science is explained Viv Forbes in Carbon Delusions.
The relentless war on carbon is justified by the false assumption that global temperature is controlled by human production of two carbon-bearing “Greenhouse Gases” [carbon dioxide and methane]
The scary forecasts of runaway heating are based on complicated but narrowly-focused carbon-centric computerised Global Circulation Models built for the UN IPCC. These models omit many significant climate factors and rely heavily on dodgy temperature records and unproven assumptions about two trace natural gases in the atmosphere.
The models fail to explain Earth’s long history of changing climates and ignore the powerful role of interacting cycles in the solar system which determine how much solar energy is absorbed and reflected by Earth’s atmosphere, clouds and surface. Several ancient societies and some modern mavericks, without help from million dollar computers, recognised that the sun, moon and major planets produce cyclic changes in Earth’s climate.
Earth’s total supply of carbon does not change – it just moves continually around the great carbon cycle residing temporarily as gases, liquids or solids in the atmosphere, oceans, biosphere and lithosphere.
Currently the supplies of carbon dioxide in the atmosphere are recovering gently from record lows. No one knows exactly where it is all coming from but limited measurements and extrapolations indicate that about 96% of the CO2 added annually to the atmosphere is from nature. The only part of the carbon cycle that is measured with reasonable accuracy is the remaining 4% of atmospheric CO2 produced through man's recycling of coal, oil and gas.
We are asked to believe that we can use dubious estimates and forecasts of this one small component of the carbon cycle as the main input for computer models claimed to forecast future climate for decades ahead.
To use such dodgy forecasts to justify disruptive energy policies is a costly delusion.