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Source: American Enterprise Institute
SRM is not a single technology; rather, it is a family of possible technologies. Below are examples of prominent SRM concepts, but it is important to note that other proposals do exist, and many experts believe that we have barely begun to explore the full range of possible methods of global cooling through SRM:
Atmospheric Aerosol Injection: Strategy entails the injection of small volumes of matter (generally sulfur-based aerosol particles) into the stratosphere so as to scatter back into space a fraction of the solar radiation that otherwise would have reached Earth, thereby decreasing global mean temperatures.
Cloud Whitening: Strategy entails the spraying of seawater droplets into low-level marine clouds so as to increase cloud albedo and longevity, thereby creating a cooling effect.
Space-Based Solar Radiation Management: Strategy entails the creation of solar shields or reflective mirrors to be situated in space so as to deflect a portion of the solar radiation otherwise directed towards Earth, thereby cooling the planet.
The Stratosphere extends around 31 miles (50 km) down to anywhere from 4 to 12 miles (6 to 20 km) above the Earth's surface. This layer holds 19 percent of the atmosphere's gases but very little water vapor.
In this region the temperature increases with height. Heat is produced in the process of the formation of Ozone and this heat is responsible for temperature increases from an average -60°F (-51°C) at tropopause to a maximum of about 5°F (-15°C) at the top of the stratosphere.
This increase in temperature with height means warmer air is located above cooler air. This prevents "convection" as there is no upward vertical movement of the gases. As such the location of the bottom of this layer is readily seen by the 'anvil-shaped' tops of cumulonimbus clouds.
Particulate matter that consists of compounds of sulfur formed by the interaction of sulfur dioxide and sulfur trioxide with other compounds in the atmosphere. Sulfate aerosols are injected into the atmosphere from the combustion of fossil fuels and the eruption of volcanoes like Mt. Pinatubo. Sulfate aerosols can lower the Earth's temperature by reflecting away solar radiation (negative radiative forcing). General Circulation Models which incorporate the effects of sulfate aerosols more accurately predict global temperature variations. See particulate matter, aerosol, General Circulation Models. 
Source: Physical Geology - Krakatoa Eruption
The Skies Change
In the weeks following the eruption, fine fragments of tephra and dust that were propelled kilometers into the stratosphere began to make a ring around the equator. They would remain suspended there for years causing remarkable solar effects and atmospheric hazing as they bent the incoming light. Also the enormous volumes of sulfur dioxide gas molecules that were ejected into the atmosphere combined with water to make sulfuric acid. These acidic aerosols sufficiently blocked enough sunlight to drop the Earth's temperature by several degrees for a few years.
Well, the earth did rather well for millions of years without the need for our "Management".
I'm sure someone will say "But look what we've done to the earth". But they forget that once upon a time the earth was much more active with volcano's popping all over the place, pumping out gases in a way that we humans could never match, and darkening the skies with the ash, and yet the world continued,
and it turned into the amazing world we have today, and it did all that without needing our help.
The only real damage we've done that should be corrected is the deforestation...oh, and the fracking should be stopped!
originally posted by: waynos
Wrabbit,you put three things in your title, but only wrote about two of them?
I didn't disagree with anything you wrote in your OP, but then, you didn't mention chemtrails so there was nothing to disagree with. Were you being mischievous including them in your title? I think discussions about GE and SRM would do themselves more good if they could forget about the chemtrail silliness altogether, after all, none of the things in your OP could be mistaken for contrails, they are quite distinct, and worthy of deeper understanding and discussion without distractions from a circus sideshow, wouldn't you agree?
That would be great! In fact, there's time left to edit this part of your post
Can we please avoid the whole chentrail/contrail argument for once?
Stratospheric aerosol injection of sulfuric acid would not even be visible from the ground. 99% of all water in the atmosphere is in the troposphere. So, how about it?
SRM by methods of spraying chemicals from airplanes to combat global warming would and should be considered "chemtrails".