Well for what it is worth, I did a degree in Ecology in the lat 80s and there was plenty of data then to support global warming.

Global warming is happening end of story. Regardless of its cause (humans or one of this planets climatic cycles) there are only really two questions that concern me.

1) "what will the impact be on the human race"

2) "what can we do to limit this impact"

It will not be anything like "The Day After Tomorrow" however it is much more likely that ecological niches (i.e. keeping particular disease in particular parts of the world) will shift, summers will become hotter and winters colder.

For the record, greenhouse gases are NOT linked to the depletion if the ozone layer. That is mediated by CFCs (used to be used as coolants). Greenhouse gasses (things like carbon dioxide) are released by burning stuff (like car engines / power stations etc).