By Alexandra Banner, CNN (CNN) — The world is celebrating Earth Day today — but the truth is, we could all live a “greener” lifestyle to better preserve our planet. For example, despite global efforts to rein in plastic pollution, only 9% of it is actually recycled. Here’s what else you need to know to Get Up to Speed and On with Your Day. 1. Columbia University Surging tensions at Columbia University have sparked condemnation from the White House as pro-Palestinian demonstrations on campus stretch into their fifth day. “In recent days, we’ve seen harassment and calls for violence against...