in the s and the s thailand and india both applied a lower tax rate on unleaded fuels rather than increasing taxes on leaded fuels to successfully phase out leaded fuel cottrell et al in viet nam environmental tax revenues increased between and in china too revenues increased between and further changes are planned which are expected to perpetuate this trend in thailand new measures to reduce ghg emissions in the transport sector were introduced in including a new system of vehicle registration taxes based on carbon dioxide emissions expected to raise thb billion as well as a new system of transport fuel taxation based on carbon emissions and other measures to deal with waste water pollution and transport the world banks partnership for market readiness programme reflects a broad interest in the region for carbon pricing schemes of one sort or another