Renewable hydrogen is expected to play an important role in European decarbonisation efforts. A previous JRC study showed that importing hydrogen from a location where renewable energy is cheaper can be more cost effective than producing it locally. However, the environmental impact of transporting large amounts of hydrogen over long distances has not been fully understood yet. Our work aims at advancing this field by comparing the life cycle environmental impacts of three options for delivering hydrogen from a distant location (i.e., hydrogen compression, liquefaction, and chemical bonding to other molecules) to on-site production via steam methane reforming (SMR) or electrolysis.