Contrail conspiracy

[dadums]

I do not remember the particulars, but after 9/11 and there was not any air traffic, some lab did a test. If I remember correctly, they found the earth was warmer since there were no contrails.

[Fear_Itself]

Original column:

Are jet contrails the latest threat?

[Frazzled]

What you’re thinking of is the theory of Global Dimming:

Global dimming

which was also featured on NOVA:

NOVA | Dimming the Sun | PBS

The upshot of this theory is that pollution, and especially jet contrails are blocking some of the light of the sun from hitting the Earth. 9/11 gave us some real data. Unfortunately I can’t remember what the name is but there was an impact on US temperatures when we were grounding planes that was not felt in Mexico and Canada where air traffic was normal.

Global Dimming does not change the theory of Global Warming. Climate change is occuring and there is a balance between the effects of carbon dioxide and pollution. The fear is what will happen when the scales tip.

[Frazzled]

I was just looking at the PBS site I listed above and saw that there was an article posted about the effects of contrails on the climate: NOVA | Dimming the Sun | The Contrail Effect | PBS.

This quote from the article refers exactly to what you were asking

Another study that took advantage of the grounding gave striking evidence of what contrails can do. David Travis of the University of Wisconsin-Whitewater and two colleagues measured the difference, over those three contrail-free days, between the highest daytime temperature and the lowest nighttime temperature across the continental U.S. They compared those data with the average range in day-night temperatures for the period 1971-2000, again across the contiguous 48 states. Travis’s team discovered that from roughly midday September 11 to midday September 14, the days had become warmer and the nights cooler, with the overall range greater by about two degrees Fahrenheit.

[Wheelz]

Interesting, but what makes it a “conspiracy”?

[Johnny_L.A]

@Wheelz

Interesting, but what makes it a “conspiracy”?

The conspiracy is about chemtrails.