stamp: "April 22, 2014, the U.S. Postal Service celebrates Earth Day by unveiling a new Forever international rate stamp inspired by a simulation of sea surface temperatures from a NOAA model of the Earth’s climate. The round stamp depicts the globe with North America in the center, surrounded by vivid bands of blue, green and red, signifying the varying temperatures of sea surface waters." http://research.noaa.gov/News/NewsArchive/LatestNews/TabId/684/ArtMID/1768/ArticleID/10540/US-Postal-Service-unveils-new-Earth-Day-stamp-celebrating-NOAA-Climate-Science.aspx