Science is important. But honestly there are conflicting scientific opinions.
The ‘Greenhouse Hypothesis’, on which IPCC’s belief in AGW is based, is that atmospheric gases trap heat. But this old (19th century) notion is merely an idea, not a hypothesis, because it is untestable, impossible to prove in a laboratory as no experimental container can imitate Earth’s uncontained, well-mixed atmosphere.
All the IPCC computer models are extremely unreliable, e.g. forecast warming for 1995 to 2015 turned out to be 2-3 times too high. See also www.wnd.com/2017/07/study-blows-greenhouse-theory-out-of-the-water/ principia-scientific.org/r-i-p-greenhouse-gas-theory-1980-2018/
Until man began adding CO2 about 1850, warming (determined from ‘proxies’ like tree rings) since the 1600AD Little Ice Age peak was accompanied by slowly rising CO2 (measured in ice cores). A simple explanation is CO2 release by ocean water, whose CO2-holding capacity decreases upon warming.
Supporting this sign that CO2 is a consequence, not a cause, of global warming, a published study of 1980-2011 measurements showed that changes in warming rate precede changes in CO2’s growth rate, by about a year.
Since the 1850 start of man’s additions, CO2’s rise has generally accelerated, without reversals. In stark contrast, the post-1850 to present-day continuance of warming out of the Little Ice Age was interrupted by frequent small coolings of 1-3 years (some relatable to ‘volcanic winters’), plus two 30-year coolings (1878 to 1910, 1944 to 1976), and the famous 1998 to 2013 ‘global-warming pause’ or ‘hiatus’
This unsteady modern warming instead resembles the unsteady rise of the sun’s magnetic output from 1901 toward a rare solar ‘Grand Maximum’ peaking in 1991, the first in 1700 years. After the previous solar Grand Maximum (4th century, long before industrial CO2), in the next decades Earth warmed to near or above today’s temperature. Then ‘sawtooth’ cooling proceeded, through the Dark Ages and ‘Medieval Warm Period’, into the Little Ice Age, paralleling a 1,000-year unsteady solar decline. This 4,500-year cooling contradicts IPCC computer models that instead predict warming by the simultaneous (slow) rise in CO2. This is the ‘The Holocene Temperature Conundrum’ of Liu et al. (2014).
Cross-correlating post-1880 graphs of solar-magnetic flux versus Earth’s temperature suggests a 25-year timelag, such that the 2016 peak temperature corresponds to the 1991 solar peak. The lag is probably due to the ocean’s high thermal inertia due to its enormous volume and high heat capacity, hence slow response to warming.
Dr Robert Higgs work shows that Global Warming’s real cause was a solar build-up to a rare Grand Maximum, which man’s industrialisation accompanied by chance. So IPCC demonising CO2 as a ‘pollutant’ is a colossal blunder, costing trillions of dollars in needless & ineffectual efforts to reduce it. Global cooling is now in progress since February 2016, matching the sun’s 28-year decline from 1991 to today, and allowing for the 25-year time-lag.
IPCC could be wrong − there is ample evidence that the sun, not CO2, drove modern global warming
It’s not just one scientist for example, there is the ‘Svensmark Theory’ which says increased solar magnetic flux warms Earth by deflecting cosmic rays, thus reducing cloudiness, allowing more of the sun’s warmth to heat the land and ocean instead of being reflected. In support, a NASA study of satellite data spanning 32 years (1979-2011) showed decreasing cloud cover.