U fiirso qoraalka hoose ka dibna ka jawaab su'aasha kadib isla luqadda qoraalka:  Xigashada Sawirka: Sanadkii 1974 Frank Sherwood Rowland, oo ah Professor ka ah cilmiga kiimikada ee Jaamacadda California ee Irvine, iyo saaxiibkiis Mario J. Molina ayaa soo jeediyay in xeryahooda halogenka ah ee cimrigoodu dheer yahay, sida CFCs, ay u dhaqmaan si la mid ah sida Crutzen u soo jeediyay nitrous oxide. James Lovelock waxa uu dhowaan ogaaday, intii uu ku guda jiray safarkiisa koonfurta Atlantic sanadkii 1971, in ku dhowaad dhammaan waxyaabaha loo yaqaano CFC-yada oo la soo saaray tan iyo markii la sameeyay 1930 ay wali ku jiraan hawada. Molina iyo Rowland waxay ku soo gabagabeeyeen in, sida N2O, CFCs ay gaari doonaan stratosphere halkaas oo ay ku kala go'i doonaan iftiinka UV, iyagoo sii deynaya atamka koloriin. Sanad ka hor, Richard Stolarski iyo Ralph Cicerone oo ka tirsan Jaamacadda Michigan waxay muujiyeen in Cl uu ka waxtar badan yahay NO si loo xakameeyo burburka Ozone. Michael McElroy iyo Steven Wofsy oo ka tirsan jaamacadda Harvard University ayaa gaaray gunaanad la mid ah. Labada kooxood midkoodna, si kastaba ha ahaatee, ma uusan ogeyn in CFC-yada ay yihiin ilo weyn oo laga yaabo inay ka soo baxaan chlorine-ka stratospheric - taa bedelkeeda, waxay baareen saameynta suurtagalka ah ee ka soo baxa HCl ee ka soo baxa Space Shuttle, oo aad uga yar.  Suaal: Halkee ayuu Rowland ka ahaa macalinka?
Jaamacadda California ee Irvine