The Federal Government Announced Today That 2014 Was The Hottest Year For The Planet In The 135 Years That Records Have Been Kept. Greenhouse Gas Concentration, Land Surface And Sea Temperatures All Clocked In At Historic Levels. Economics Correspondent Paul Solman Explores A Couple Of Climate Change With The Authors Of A Recent Book On The Subject. It?s Part Of Our Weekly Segment Making Sense, Which Airs Every Thursday On The ?Newshour.? Martin Weitzman, Harvard University: So, Look, You Can Start To See Erosion Along Here. Paul Solman: Economist Marty Weitzman Thinks His Property On A Marsh In Gloucester, Massachusetts, Is Washing Away Due To Climate Change. Martin Weitzman: The Water Has Risen A Couple Of Inches In The Time, In The 40 Years I Have Been Living Here. Paul Solman: Right. Martin Weitzman: And What?s Happened Is That It?s Caused Erosion At The Edge Of The Lawn. Paul Solman: Well, But A Couple Of Inches Doesn?t Seem Like Much. Read More?at ?www.pbs.org