Namibia is committed to move ahead with its mitigation programme in the different sectors. In the building sector, the objective is to reach at least 80% of the total gross floor area meeting Green Buildings standards by 2030. In the transport sector, the country has a high public transport mode share. To further encourage the use of public transport, Namibia will increase its rail network from the present 230 km to 360 km by 2030. This will enable more households to be within a ten-minute walk of a train station. Namibia also has one of the most stringent and innovative system to control vehicle ownership and usage, through a vehicular quota and road pricing system. Since February 2018, the permissible growth rate of private vehicle population has been reduced to zero per cent, from 0.25%, effectively capping the growth of private vehicles. In 2013, a system of rebates and surcharges was introduced to encourage car buyers to purchase low-emission cars. In the same vein and in 2016, Namibia implemented a carbon tax starting at N$40 per g/km of CO emitted to apply between 2016 and 2020 as a transition period. The intent is to increase this carbon tax to cover all vehicle categories by 2030.