In the following video, Fool contributor Matt Thalman discusses why he believes both Waste Management (WM -0.62%) and Duke Energy (DUK -0.44%) are two stocks an investor could buy hold for the next 20, 30, even 50 years without worry. Matt sees both as leading stocks in industries we couldn't live without. Agree? Disagree? Check out the video and let us know what you think.