How did global warming occurs?
You should learn some grammar before asking any questions.
Global warming is both a natural process and a human induced process natural global warming started which the formation of the oceans resulting in water vapour trapping heat. Human induced global warming occurs mostly after the industrial revolution when fossil fuels became heavily used and burnt releasing stored co2.
What are some connections between CFC's breaking down the ozone layer and how does it increase global warming with weather that occurs in the troposphere?
True global warming does not decrease temperatures. So, either the model for global warming's effects is hokus-pokus, or global warming as presently claimed, does not exist. Some global warming followers will have you believe that global warming makes the weather "act crazy". If true, then it is not really global warming, is it.