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Harvard faculty talk about their concerns and fears about climate change as the world commemorates Earth Day’s 50th anniversary.

United kingdomAl qahirahRayna gianniniJohn holdrenRobertn stavinsRobert stavinsTyler gianniniAaron bernsteinAmaya gianniniThomas gloriaThomasp gloriaKris snibbe harvardRachel carsonJohnp holdrenStephanie mitchell harvardHarvard extension school