A dry winter, ravenous hunger and accessible trash have drawn bears to Fort Carson, Colorado, where officials have received 23 reported bear sightings just this year.The real number, they believe, is likely much higher. Capt. Robert Look Jr., chief of conservation law enforcement for Fort Carson, said low snowpack, a condition called seasonal hyperphagia — where an animal’s insatiable urge to eat overrides a natural fear of humans — and loose ga…