Even though Thailand accounts for less than 1 percent of global emission in 2013, the Royal Thai Government has placed climate change among the top national priorities. In 2014, Thailand submitted its nationally appropriate mitigation action (NAMA) pledging to reduce its greenhouse gas emission by 7-20 percent from the projected business as usual level by 2020. Up to date, the NAMA implementation evidently offers the promising mitigation outcome and ensures that we are on a strong track to meet our 2020 target. As a party to the Paris Agreement, Thailand has already submitted its (intended) nationally determined contribution ((I)NDC) in 2015, aiming ambitiously to reduce its greenhouse gas emissions by 20-25 percent from the projected business as usual level by 2030. To ensure the continuity in our mitigation actions from NAMA to NDC, the cabinet approved the NDC roadmap on mitigation (2021-2030) in May 2017. This roadmap prioritizes important mitigation measures on renewable energy and energy efficiency specified under the Power Development Plan, Alternative Energy Development Plan, and Energy Efficiency Plan as well as ambitious actions to promote road-to-rail modal shift for both freight and passenger transport, by extending mass rapid transit lines, constructing double-track railways and improving of bus transit in the Bangkok Metropolitan region, given under the Environmentally Sustainable Transport System Plan.