title: The mystery of the expanding tropics.
authors: Olive
authors: O
authors: Heffernan
mesh_terms: D000383:Agriculture; D001272:Atmosphere / Q000032:analysis* / Q000737:chemistry; D044822:Biodiversity; D003889:Desert Climate; D055864:Droughts / Q000706:statistics & numerical data; D057232:Global Warming / Q000706:statistics & numerical data; D006358:Hot Temperature; D008962:Models, Theoretical; D010126:Ozone / Q000032:analysis; D011891:Rain; D053260:Soot / Q000032:analysis; D013997:Time Factors; D014329:Tropical Climate; D035501:Uncertainty
chemical_list: D053260:Soot; D010126:Ozone