If CM are initiated, increases in emission levels would be more moderate (Figures 5.4 and 5.5). Some of the sectors where CM could be significant and effective include transport, green buildings, adoption of energy-saving equipment, switch to natural gas and renewable energy sources, and smart power plants. In Viet Nam, policies to improve the public transport system and encourage the introduction of less polluting and noisy motorcycles - the main form of private transport in both major and small cities - would lower urban pollution and noise.