An analysis of the IPCC's gold-standard global temperature dataset reveals long-term changes in global warming as less than predicted by the AGW hypothesis - the UK empirical evidence (HatCRUT3) confirms that human CO2 is producing a minimal to trivial effect relative to the UN's IPCC climate change scenarios
(click on charts to enlarge - data sources)
The chart's starting point is January 1880, which represents the first data point (pink circle) of a 30-year temperature change, from January 1850 to January 1880. The chart's last plot point (green circle) is the difference from December 1982 to December 2012.
The black curve is the simple 5-year average (60-month moving) of all the 30-year changes. And the light grey curve is the plot of monthly CO2 atmospheric CO2 levels from 1880 through 2012.
Per this gold-standard empirical evidence, one can safely conclude the following:
#1. CO2 levels have consistently increased, with short pauses, over this extended period.
#2. 30-year temperature changes peaked both in 1939 and 1998, and then subsequently declined indicating a more powerful-than-CO2, non-greenhouse gas influence at work.
#3. Higher CO2 levels are not causing runaway, accelerating, rapid, irreversible, dangerous and/or tipping point long-term global temperature changes, which is contrary to all conventional and "consensus" IPCC expert opinions and their climate models.
#4. The simple 5-year moving average curve during the very recent past indicates a declining period for 30-year changes, possibly signalling an extended cooling phase is upon us.
#5. The 30-year temperature changes, prior to the post-1960 consumer/industrial surge in human CO2 emissions, rival those of the modern up/down 30-year changes, in terms of amount, duration and speed.
#6. Long-term (30 year) global temperature change appears to follow an up and down pattern - an oscillation phenomenon, so to speak, that occurs regardless of CO2 levels.
#7. Since this oscillation is not being produced by higher CO2 levels, then some natural phenomenon is likely driving long-term global temperature change, overwhelming the apparent trivial impact of CO2.
There are any number of natural climate phenomena working singularly, or in concert, that are responsible for climate change. An example of one such natural pattern is the Atlantic Multidecadal Oscillation (AMO) that is adjacent and shown here.
As can be seen, the AMO pattern is curiously similar to the above 30-year global temperature change plot of peaks and valleys.
As NOAA scientists have established, this powerful, climate-changing oscillation has been identified in historical paleoclimate proxies, confirming that human CO2 has nothing to do with it.
And the AMO is just one of many natural climate forces. Another powerful, natural climate-change phenomena that dwarfs the global warming impact of human CO2 is the El Niño–Southern Oscillation, which is best explained by this expert.
Additional temperature and climate charts.