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Answer to #5:
The greenhouse effect is the warming of the surface and lower atmosphere that is caused by the conversion of solar radiation into heat it is then absorbed by the planet's surface, which is reflected into the atmosphere where it is partly absorbed and partly reradiated back to the surface. Freon which is in the atmosphere for up to 116 YEARS enhances this effect because it keep producing the Cl radical for over a century and this Cl radical as seen in the question above destroys the ozone. The ozone is the protective layer that keeps this so called greenhouse effect from happening.
US Environmental Protection Agency
The European Union's (EU) Solvent Emissions Directive
And from Editorial