A　sustainable　system　for　the　carbocarboxylation　of　olefins　with　redox-active　esters　and　CO(2　)via　visible-light-induced　photoredox　catalysis　has　been　developed　using　metal-free　boron　carbonitride　(BCN)　as　the　photocatalyst.　The　scheme　introduces　versatile　alkyl　groups　(including　primary,　secondary,　and　tertiary)　and　CO2　into　the　C-C　double　bond　in　a　fully　regioselective　manner　to　produce　valuable　carboxylic　derivatives　with　excellent　yields.