Conventional　structural　materials-concrete　and　steel-have　been　producing　a　substantial　amount　of　carbon　emissions　to　the　earth,　accounting　for　over　50　%　of　industrial　emissions　worldwide.　An　urgent　call　has　been　made　for　an　alternative　structural　material　with　a　better　environmental　impact.　In　this　regard,　this　work　investigated　the　carbon　emissions　of　durable　FRP　composite　structures　in　civil　engineering.　Three　typical　FRP　composite　structures　were　focused,　including　pedestrian　bridges　constructed　by　FRP　structural　profiles,　concrete　structures　reinforced　by　FRP　rebars,　and　existing　concrete　and　steel　structures　strengthened　by　FRP　sheets.　Carbon　emissions　were　investigated　in　terms　of　the　carbon　footprints　per　available　dataset.　Direct　carbon　reductions　were　observed　in　three　FRP　composite　structures,　and　also,　indirect　carbon　reductions　were　discussed,　including　FRP　reinforcement　for　concrete　structures　and　FRP　enclosure　for　houses.　The　observed　carbon　reductions　realized　by　FRP　composite　structures　successfully　showcased　their　great　potential　in　reducing　the　carbon　emissions　in　civil　engineering.