it doesnt mean anything other than I’d say its very relevant to “contrail science”.

And Uncinus, I assume you’re suggesting hydrogen airplanes?

Hydrogen planes would be great in terms of lack of pollution, however they would probably increase cloud cover more than regular jets. That could be mitigated by altering the flight altitude if it were a serious problem.

I’m also in favor of the Trimaran ocean salt spraying approach, if such a thing ever becomes necessary. Ideally we would avoid such a need.

http://news.bbc.co.uk/2/hi/programmes/6354759.stm

But the key point that this site is making is all about evidence. Is there any actual evidence that anything like this is going on? Anyone seen any inexplicably odd trimarans? Anyone seen any inexplicably odd contrails?

And if they were going to do it, why would they do it in secret?

it doesnt mean anything other than I’d say its very relevant to “contrail science”.

It’s an interesting idea.
It has all of the virtues (assuming it works and the quantities are correct) and none of the vices of the competing “geoengineering” proposals. In fact it has no vices at all.
If ever it becomes necessary to use geoengineering to mitigate the consequences of global warming then I hope Salter’s Trimarans are used first.

And Uncinus, I assume you’re suggesting hydrogen airplanes?

http://www.youtube.com/watch?v=fg7J8P-uXqM

What does this actually mean to you?

Dunno how image tags work here so I’m just gonna post a link. Feel free to edit it to look all tidy, like.

http://img706.imageshack.us/img706/7951/700756d18ecd.jpg

I said:

It was though, a rather unusual day. It’s very rare to see such a profusion of contrails. Maybe 2-3 times a year. As it has always been.

Now that’s very specific. 2-3 times a year have the high degree of contrail cover that march 5th 2010 had. It was a VERY high frequency contrail day.

There are obviously days that have LESS contrail cover, but still have persistent contrail cover.

Days with contrail cover happen more frequently in the winter.

What do you mean by “very often”? 50% of days? 10%? 90%? All year round?

Not rare, this happens very often.