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Originally posted by Zaphod58
It takes quite a high temperature to affect the ability of a plane to take off, and we haven't seen that kind of temperature change. Nothing else in global warming would affect the military activities going on around the world.
Originally posted by FatherLukeDuke
Can anyone post any scientific evidence that would support the claim that spraying contrails laced with chemicals (which chemicals?) would stop global warming? Any data? Any research papers? Any respected scientists opinions? Anything?
Air traffic and, therefore, contrails, are not evenly distributed around the globe. They are concentrated over parts of the United States and Europe, where local warming reaches up to 0.7 watts per square meter, or 35 times the global average. The ghostly white trails following airplanes and rockets through the sky, called contrails, are probably adding to global warming, according to scientists at NASA’s Langley Research Center, Hampton, Va. The contrails often turn into cirrus clouds, a thin, wispy type of cloud made of ice crystals. The most common form of high-level clouds are thin and often wispy cirrus clouds. Typically found at heights greater than 20,000 feet (6,000 meters), cirrus clouds are composed of ice crystals that originate from the
freezing of super cooled water droplets. Cirrus generally occur in fair weather and point in the direction of air movement at their elevation. While some clouds tend to help cool the globe and negate the affects of global warming, thin cirrus clouds are heat trappers, holding in more heat than they reflect back into space.
Contrails are human-induced clouds that only form at very high altitudes (usually above 8 km) where the air is extremely cold (less than -40°C). If the air is very dry, they do not form behind the plane. If the air is somewhat moist, a contrail will form immediately behind the aircraft and make a bright white line that lasts for a short while. Persistent contrails form immediately behind the airplane in very moist air. Persistent contrails can exist long after the airplane that made them has left the area. They can last for a few minutes or longer than a day. However, because they form at high altitudes where the winds are usually very strong, they will move away from the area where they were born. Persistent contrails are those most likely to affect climate.
A key consideration in this study is the proliferation of short-haul flights. These are currently thought to be more environmentally disruptive than long-haul flights because of the high quantity of fuel needed for take-off and landing. In a short haul, this is not balanced by a long, fuel-efficient cruise. However, contrail effects are not taken into account in current environmental risk assessments of air travel. The team are investigating whether the picture would change if they were. The reason is that short-haul flights seldom reach the altitude where contrails form and this might make them overall more environmentally friendly than high-flying long-haul flights.
As well as the seasonal variation in atmospheric conditions, which the team estimated would require a general ceiling on flight altitudes (summer: 31,000 feet, winter: 24,000 feet), they also found significant day to day variations, so any contrail reduction strategy would work better if it were reactive on a daily basis. They also found days when the atmospheric conditions made it almost impossible to avoid contrail formation.
* Air travel also has a disproportionate short-term effect on climate: Carbon dioxide has the same effects on the climate no matter when or where it is injected into the atmosphere. But other aircraft emissions—such as nitrogen oxides—have potent, climate-changing effects because of the elevation at which they are released. Over the short term, they more than double the effects of the CO2 alone (see endnote 1). Over time, these other pollutants disappear, but the carbon dioxide remains aloft capturing heat for decades.
* These short-term climate-altering effects of air travel are concentrated, along with the residents of affluent nations, in the mid-latitudes of the northern hemisphere, which includes the Pacific Northwest.
(B) Such terms include exotic weapons systems such as--
(i) electronic, psychotronic, or information weapons;
(ii) chemtrails;
(iii) high altitude ultra low frequency weapons systems;
(iv) plasma, electromagnetic, sonic, or ultrasonic weapons;
(v) laser weapons systems;
(vi) strategic, theater, tactical, or extraterrestrial weapons; and
(vii) chemical, biological, environmental, climate, or tectonic weapons.
Originally posted by Implosion
I haven't read through this whole thread, so if this has been brought up already, apologies.
If you go to this page [note the .gov], and scroll down to the bottom, you will see, in black and white:
(B) Such terms include exotic weapons systems such as--
(i) electronic, psychotronic, or information weapons;
(ii) chemtrails;
(iii) high altitude ultra low frequency weapons systems;
(iv) plasma, electromagnetic, sonic, or ultrasonic weapons;
(v) laser weapons systems;
(vi) strategic, theater, tactical, or extraterrestrial weapons; and
(vii) chemical, biological, environmental, climate, or tectonic weapons.
I was always sceptical about "chem-trails" However, after seeing what I have posted above, I have started to think that it is not as whacked out as I previously thought.
Originally posted by EssanNotice the list also includes extraterrestrial weapons. Do you really think there's a US missile base on the Moon? And what about plasma weapons? Or tectonic weapons? Surely the list is intended to be all-inclusive of all conceivable forms of weapon, not necessarily those currently, or in the near future, within our technological capabilities.
Originally posted by LoneGunMan
The ones you have shown though are vapour trails.
[edit on 18-1-2006 by LoneGunMan]