A　metal-free　heterogeneous　protocol　is　established　herein　for　the　synthesis　of　value-added　gamma-amino　acid　scaffolds　via　carbocarboxylation　of　alkenes　with　CO2　and　alkylamines　under　visible　light　irradiation.　The　protocol　shows　broad　substrate　scope　under　mild　reaction　conditions　and　good　stability　of　the　catalyst　for　recycle　tests.　Moreover,　the　methodology　could　be　feasible　to　the　late-stage　derivatization　of　several　natural　products,　enriching　the　chemical　arsenal　for　practical　application.