Climate change

First, climate change and the current episode of global warming are real, and to claim otherwise is disingenuous. The peak of the last ice age occurred roughly 20,000 years ago, the peak of the next ice age is expected to occur about 80,000 years from now. Over the past 2,000+ years, Earth has experienced multiple warming and cooling periods, including the Roman Warm Period, the Dark Ages Cold Period, the Medieval Warm Period, the Little Ice Age, and the current warming period. Most (though not all) of these variations can be explained by changes in planetary orbits that alter the amount of solar radiation reaching Earth.

Human activity is certainly responsible for some portion of the current warming, particularly through deforestation and urbanization. However, many physicists—specifically those with a deep understanding of thermodynamics at the molecular level rather than climatologists or meteorologists—argue that variations in solar radiation are the primary driver of climate change, though not the only one. Changes in incoming solar radiation can largely (but not entirely) be explained by orbital cycles, sunspot activity, and volcanic eruptions. It is reasonable to agree that the amount of solar radiation reaching Earth plays a significant role in determining global temperatures and climate.

Other factors that influence climate include the amount of cosmic rays reaching Earth’s atmosphere. Cosmic rays ionize the atmosphere, providing nuclei around which water droplets can condense. A decrease in cosmic rays results in fewer ions, reduced cloud formation, increased solar radiation reaching the surface, and warmer temperatures. Conversely, an increase in cosmic rays leads to more ionization, increased cloud cover, reduced solar radiation, and cooler temperatures. Cosmic rays originate both within and beyond our solar system, and the number that reach Earth depends on several variables.

The only computer climate models that have come close to accurately reproducing past climate changes have relied primarily on orbital cycles that affect solar radiation, rather than on greenhouse gases such as CO₂. While CO₂ and other greenhouse gases—most notably water vapor, which is by far the most abundant—have long been a theory of climate change but many physicists have proven otherwise.

Climate Change Theory (Douglas J Cotton, B.Sc (Physics))  http://www.climate-change-theory.com

Roy Spencer PhD https://www.drroyspencer.com

Article about solar variations based on Jupiter-Saturn and the 11-year solar cycle https://www.sciencedirect.com/science/article/abs/pii/S1364682612000648

 Article about how increased CO2 cools the atmosphere http://ruby.fgcu.edu/courses/twimberley/EnviroPhilo/CoolingOfAtmosphere.pdf

Astronomically based decadal-scale empirical harmonic climate model http://www.sciencedirect.com/science/article/pii/S1364682611003385

Global temperature report of the lower troposphere https://www.nsstc.uah.edu/climate

That's 0.3% consensus, not 97%! https://joannenova.com.au/2013/07/thats-a-0-3-consensus-not-97

Consensus among scientists crumbles (Forbes)  http://www.forbes.com/sites/jamestaylor/2013/02/20/as-the-consensus-among-scientists-crumbles-global-warming-alarmists-attack-their-integrity

Documentary "The Great Global Warming Swindle". https://youtu.be/H3IhIUBghPc

Average of 18 non tree ring proxies of temperature from 12 locations around the northern hemisphere published by Craig Loehle in 2007.

General chart of the effect of sunspot activity & Milankovitch orbital cycles have on the earths temps.

Interglacial Temperature over the last 10,000 years.

In past history CO2 increases lag behind global temperature increases by about 800 years.