Milena Holmgren (an haife ta a shekara ta 1966) ita ce masaniyar ilimin tsabtace muhalli ta ƙasar Chile wacce malama ce a Jami'ar Wageningen kuma marubuciya ce sama da 60 da aka yi bitar ƙwararru waɗanda aka buga su a cikin irin waɗannan mujallu kamar Frontiers in Ecology da Muhalli, Oikos, Science, da sauransu da yawa. A watan Satumban shekara ta 2011 ta yi tafiya zuwa Guinea ta sama inda ita da ƙungiyarta suka bayyana dalilin da ya sa kashi 80% na nau'ikan jinsin suka fi son gandun ruwan sama a wurin. A ranar 2 ga watan Nuwamban, shekara ta 2010 ta gano cewa a Atacama Desert kawai 2% na 12,150 tsaba tsira saboda da rashin ruwan sama wanda yake kasa da 206 millimetres (8.1 in) . Abin ya ba ta mamaki, kawai Senna cumingii bai shafe ta ba saboda suna da dogaye. A wannan shekarar kuma tayi karatun Dicrodon guttulatum wanda ake samu kawai a hamadar arewacin Peru wanda ke ciyar da kashi 78% na kwari da 12% akan tsirrai. Ta kuma gano cewa kananan yaran sun fi son nau'in tsirrai na Prosopis pallida, yayin da mata ke son su da sauran tsirrai ma.