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What can civil aviation do to help save the planet?
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[quote:George B:MV8yMDA4MjY1XzQyOTI3ODgxX0U3NUM5QkVF] [quote:Anonymous Coward 36419852:MV8yMDA4MjY1XzQyOTE0OTIzX0E3NkFBRDQx] [quote:George B:MV8yMDA4MjY1XzMzNzQzMzE5X0EyOEE0NjVF] One scheme which is not talked about much . . . it doesn't use Sulfur Compounds nor does it use injection into the stratosphere is the following . . . it uses a type of high tropospheric cloud seeding to reduce cirrus clouds and thus reduce the amount of heat retained or reflected back into [b][u]Modification of cirrus clouds to reduce global warming[/u][/b] David L Mitchell and William Finnegan Desert Research Institute, Reno, NV 89512-1095, USA E-mail: david.mitchell@dri.edu Received 1 April 2009 Accepted 12 August 2009 Published 30 October 2009 Abstract. Greenhouse gases and cirrus clouds regulate outgoing longwave radiation (OLR) and cirrus cloud coverage is predicted to be sensitive to the ice fall speed which depends on ice crystal size. The higher the cirrus, the greater their impact is on OLR. Thus by changing ice crystal size in the coldest cirrus, OLR and climate might be modified. Fortunately the coldest cirrus have the highest ice supersaturation due to the dominance of homogeneous freezing nucleation. Seeding such cirrus with very efficient heterogeneous ice nuclei should produce larger ice crystals due to vapor competition effects, thus increasing OLR and surface cooling. Preliminary estimates of this global net cloud forcing are more negative than–2.8 W m–2 and could neutralize the radiative forcing due to a CO2 doubling (3.7 W m–2).[b] A potential delivery mechanism for the seeding material is already in place:[/b] [u]the airline industry[/u]. Since seeding aerosol residence times in the troposphere are relatively short, [b]the climate might return to its normal state within months after stopping the geoengineering experiment.[/b] The main known drawback to this approach is that it would not stop ocean acidification. It does not have many of the drawbacks that stratospheric injection of sulfur species has. http://iopscience.iop.org/1748-9326/4/4/045102/fulltext/ [/quote] [b]It appears the delivery mechanism (chemical trails) is already in place.[/b] "Surprise.....Surprise" [/quote] "Substances exist that nucleate ice crystals as effectively as silver iodide (AgI, the best ice nucleant known) at cirrus cloud temperatures, and some are relatively inexpensive and non-toxic (see section 2.1). If significantly larger, these artificially seeded ice crystals would fall faster, and their higher fall velocities may lead to reduced cirrus cloud coverage as predicted in GCM simulations (Mitchell et al 2008, Sanderson et al 2008). The lower cirrus cloud coverage would result in greater OLR and cooler surface temperatures, thus reducing the impact of global warming. It is important to note that the decrease in cirrus coverage would occur where the cirrus greenhouse effect is strongest (i.e. temperatures < –40 °C). This is a key principle for this geoengineering idea." [b] You will notice form this same paper (quote above) that the targeted area to mitigate Cirrus Clouds is where Cirrus Clouds naturally form . . . which is the same areas where contrails form via air traffic. So the aircraft do not produce the Cirrus Clouds they only trigger their formation when conditions are ripe . . . [/b] [b][color=red]The key to this paper is that one could use silver iodine or some other nucleating agent to dissipate Cirrus Clouds in the higher Troposphere not that it is now being done!!![/color][/b] [/quote]
Original Message
What can civil aviation do to help save the planet?
1) Does the planet need saving . . .?
2) What does it need saving from. . . ?
3) How can it be used to accomplish the task . . . saving the planet?
------
1) Does the planet need saving . . .?
Answer:
Yes
, I think this answer is fairly easy . . . most scientists and informed people believe the planet is moving toward eventual environmental catastrophe unless something changes.
2) What does it need saving from. . . ?
Answer:
Sudden climate change, Toxicity, and/or degradation of natural shields
that protect the earth from external harm.
3) How can it be used to accomplish the task . . . saving the planet?
Answer:
Civil Aviation being the largest segment of aviation can accomplish intervention within the atmosphere probably faster than any other entity based simply on numbers and frequency of opportunity.
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