But then when you arrive at the hardware store, you spot bags of cement labelled Type 1L or Portland Limestone Cement. Should you pick it up or go for the traditional Portland cement instead? Well, if you want an eco-friendly cement alternative that still looks good and lasts, you should take those bags of Portland Limestone Cement (PLC) home with you. Portland limestone cement works just as well as traditional cement, but it has a 10% lower carbon footprint. One of them is Portland Limestone Cement.