with melting ice and warming water raising sea levels and speeding up global warming. so, what can we do? >> we have to reduce very dramatically the amount of carbon dioxide that humans are causing to be put into the air. there's no doubt about that. it's late, but the best time to take action was 50 years ago, and the second-best time is right now. >> reporter: the sooner we act to protect the arctic, he says, the more we can keep dramatic disruptions there from cascading to the rest of the planet. roxana saberi, cbs news, london. >> sargent: still ahead on the "cbs weekend news," a milestone birthday for a duchess known as "the reliable royal." what makes febreze air effects different? while cheaper aerosols rely on artificial propellants... febreze uses a 100% natural propellant. check it out! pressure created by what's in your air makes the bottle spray.