Earth's climate is driven by energy coming in from a big thermonuclear reactor in the sky -- our sun -- and the redistribution of that solar energy after it reaches our planet.
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Climate models ignore, or minimize, the effects of solar energy variations.
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Clouds are important too, because they can block a majority of the sun's radiation.
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A mere 1% increase in cloudiness would explain almost all the warming measured in the 20th century.
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Climate models ignore, or minimize, the effects of clouds.
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Small variations of incoming solar energy affect cosmic rays.
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Cosmic rays are high speed atomic particles from exploded stars.
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Cosmic rays affect cloud formation.
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When the sun is weaker, more cosmic rays strike the Earth, causing more cloud cover in the lower atmosphere.
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More cloud cover blocks more solar energy, making the Earth cooler.
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Earth's climate is extremely sensitive to +/- 0.1% changes of incoming solar energy.
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The sun was more active in the twentieth century than in the nineteenth century, except for the period from 1945 to 1975.
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That means solar activity changes would explain the overall warming during the twentieth century, and also explain the cooling from the mid-1940's to mid-1970's.
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"Global warmists" want to blame climate change only on humans, because they hate economic growth and capitalism, and for over 50 years have been claiming humans are destroying the planet -- that's why they invented their unproven 'manmade CO2 controls the climate' claim.
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When surface temperature measurements do not show warming, the "global warmists" either ignore the data (1940 to 1976), or fellow cult members appointed by Obama, who run NASA and NOAA, simply make large "adjustments" to their raw temperature data to create a warming trend out of thin air (especially the May 2015 "adjustments").
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Summary of the lack of science used for the wild guess predictions of the future climate by the global warming cult:
- Ignore or minimize the effects of solar energy variations and cloud cover variations,
- Claim natural climate changes never happened
(using the thoroughly discredited Michael Mann "hockey stick" chart),
- Ignore 4.5 billion years of climate history,
- Ignore global cooling from 1940 to 1976,
- Focus only on warming after 1976, and wild guess predictions of the future climate based on computer games,
- "Adjust" data to create warming after 1998, when raw data show no warming,
- Ignore weather satellite data,
- Create biased surveys, torture the data, and then falsely claim "97% of scientists agree", without specifying what they agree on, and
- Viciously character attack everyone who expresses doubt.
Summary:
The global warming cult is 99% politics and 1% science.