Our skies are frequently covered with contrails that block the sunlight even when clear skies are in the forecast.
Some jets leave unusually long contrails that spread out to create artificial clouds while another jet following close behind will leave no contrail at all.
On page 17 of the “IPCC SPECIAL REPORT AVIATION AND THE GLOBAL ATMOSPHERE”, the conclusion that jet contrails are a cause of global warming is clear:
"Contrails tend to warm the Earth’s surface, similar to thin high clouds".
Climate Engineer, David Keith appeared on “Colbert Nation” to suggest the pollutant, sulfuric acid, could be sprayed into the atmosphere to mitigate global warming.
A reasonable person might look up more often to wonder why jet aircraft are implicated as both the cause and solution, in the issue of global warming.