▁en cyc lic al , ▁although ▁dated ▁ 2 4 ▁May ▁ 2 0 1 5 , ▁was ▁officially ▁made ▁public ▁on ▁ 1 8 ▁June ▁ 2 0 1 5 . ▁The ▁en cyc lic al ▁sets ▁apart ▁the ▁basic ▁human ▁needs ▁and ▁app et ites . ▁Francis ▁cons iders ▁that ▁the ▁former ▁are ▁small ▁and ▁non - neg oti able , ▁and ▁that ▁the ▁latter ▁are ▁potentially ▁un limited . ▁Although ▁he ▁asks ▁for ▁the ▁use ▁of ▁renew able ▁energy ▁instead ▁of ▁conventional ▁fu els , ▁he ▁thinks ▁that ▁it ▁would ▁not ▁be ▁enough ▁unless ▁society ▁turns ▁down ▁the ▁un limited ▁app et ites ▁of ▁consumer ism . ▁This ▁project ▁was ▁opposed ▁by ▁V at ican ▁conserv atives , ▁Catholic ▁conserv atives , ▁and ▁the ▁US ▁evangel ical ▁movement . ▁In ▁the ▁en cyc lic al , ▁Francis ▁states ▁" The ▁Earth , ▁our ▁home , ▁is ▁beginning ▁to ▁look ▁like ▁an ▁immense ▁p ile ▁of ▁fil th ." ▁ ▁As ▁he ▁prepared ▁for ▁the ▁en cyc lic al , ▁Francis ▁spons ored ▁a ▁Pont ific al ▁Academy ▁of ▁Sciences ▁sum mit ▁meeting ▁in ▁April ▁ 2 0 1 5 ▁that ▁focused ▁on ▁the ▁relationships ▁connecting ▁pover ty , ▁economic ▁development , ▁and ▁climate ▁change . ▁The ▁meeting ▁included ▁present ations ▁and ▁discuss ions ▁by ▁scient ists , ▁religious ▁leaders , ▁and ▁econom ists . ▁The ▁United ▁Nations ▁secretary ▁general , ▁Ban ▁Ki - mo on , ▁who ▁is ▁ur ging ▁world ▁leaders ▁to ▁appro ve ▁a ▁climate - change ▁accord