An individual automobile emits 2.5 times more CO2 per passenger than an equivalent trip by bus and five times more than by metro (ECLAC. Roughly 94% of transport uses oil derivatives as an energy source (Enerdata, 2015), which slows the decarbonization of the energy mix. Table V.1 shows that individual transport is the leading cause of pollutant emissions, with the exception of nitrogen oxides (NOx). Urban transport as a whole is a major source of greenhouse gas (GHG) emissions in the region, since it generates 38% of the C02 emissions from the burning of fossil fuels, compared to 21 % from electricity generation and 17% from industry (UN-Habitat, 2012).