Hartford Courant: Ten years ago I got caught unawares during a TV debate on global warming. Midway through the show, the industry-funded science deniers I was debating unveiled a new argument. It was so daft I mistook it for a joke, thus appearing disrespectful when I meant to be congenial; proof again you can’t be too careful on TV. The global warming debate is now two decades old. In 1988 the United Nations drew worldwide attention to it by forming the Intergovernmental Panel on Climate Change. Many …