13 - Climate change: Many means of transportation releases large amounts of carbon dioxide, which builds up greenhouse gases in the atmosphere and is harmful to the environment, increasing the global temperature. Subsequently, this causes issues such as rising sea levels, animals losing their habitats, increased frequency of extreme weather and natural disasters, increased droughts, and loss of species. Skateboarding doesn't release carbon emissions, so if it is manufactured using environmentally-friendly materials and processes, it would be a sustainable means of commuting.