Global warming: What’s for sure, what’s maybe (Minneapolis-St. Paul Star Tribune) Global warming has the feel of breaking news these days. Polar bears are drowning; an American city is underwater; ice sheets are crumbling. Time magazine proclaimed that readers should be worried. Very worried. There are new hot-selling books and a batch of documentaries, including one starring former Vice President Al Gore and his climate-evangelist slide show that is touted as "the most [News Source]