Because the theory upon which anthropogenic global warming (AGW) is based is so rock solid, because the valid available pertinent data is consistent with the theory, and because no science based challenge to the reality of AGW has ever succeeded, those who reject the very clear reality of AGW must resort to the use of what are best called myths. I would like to explore these myths and I invite others to do so also.
Myth #01 - Global Cooling
Those who reject the reality of AGW claim that in the 1970s there was a consensus among climate professionals that the Earth would soon be cooling. Solar irradiance was expected to decline and when that happened in the past the Earth cooled. About 10% of climate professionals held that view. See https://journals.ametsoc.org/doi/abs/10.1175/2008BAMS2370.1 Most of the rest understood, as most of us now know, that the greenhouse gas increase would overwhelm the reduction of solar irradiance, and the Earth would warm.
Satellite images of contrails
Article that concludes that contrails will increase global warming
Reducing the climate change impacts of aviation by restricting cruise altitudes, 2005: https://pdfs.semanticscholar.org/72ff/544af4589ff2539e4f3a22a632c92a49cbfc.pdf - "Clouds affect the atmosphere near the surface in two opposing ways: by reducing the amount of earth-emitted radiation escaping to space, and by increasing the amount of solar radiation reflected. For contrails, and other high cloud, the effect is larger for the outgoing terrestrial radiation, resulting in a warming at the surface. As a result, contrails have the potential to influence climate on a global or regional scale."
Article that seems inconclusive
https://www.wired.com/2011/03/contrails-climate/ - " … solar energy reaching the surface may be reduced, resulting in surface cooling. They also reduce the terrestrial energy losses of the planet, resulting in a warming."
An article on the Heartland Institute (climate change skeptic organization) on measures to prevent global cooling
https://www.heartland.org/news-opinion/news/saving-humanity-from-catastrophic-global-cooling-a-task-for-geo-engineering - includes a suggestion to intentionally increase cirrus ice crystals, referencing the effect of contrails, i.e., "… creating a major GH effect and possibly even some detectable warming at the Earth's surface."Here's a site that argues contrails will cause global dimming, e.g., "Goodbye sunshine":http://www.contrails.nl/contrails-research/global%20dimming%2001.htm