Calgary Herald: American scientists are hoping to determine if climate change is causing grizzly bears to hibernate later each fall and emerge from their winter slumber much earlier. It’s a trend that has been noticed on both sides of the border. Researchers in the Greater Yellowstone ecosystem want to know if shifting weather patterns may be influencing the denning behaviour of some of the area’s 500 to 600 grizzlies. Their findings, based on data collected from 1975 to 1999, show …