climate change July 23, 2020 4:10 am Extinction Event: How Climate Change May Spell Doom for the Polar Bear New study reveals the polar bear may become extinct by end of the 21st century because of climate change. US & World Videos 1:12 5 things to know about Tom Thibodeau 1:41 County releases proposed $8.48B budget as it searches for next chief 1:15 San Diego weather today: Sheena Parveen's forecast for May 3, 2024 2:30 13 cars impounded, 2 people arrested after sideshows in San Diego County: Police 0:45 Knicks defeat 76ers, advance to Eastern Conference second round