Asia's greenhouse gas emissions will treble over the next 25 years, according to a report commissioned by the Asian Development Bank (ADB). The report provides detailed analysis of the link between transport and climate change in Asia.

It says that its estimate of future levels of greenhouse gas could even be an optimistic assessment. Air pollution and congestion will seriously hamper the ability to move people and goods effectively, it warns. The report, Energy Efficiency and Climate Change: Considerations for On-Road Transport in Asia, says that Asia currently has low levels of personal motorized transport, which in many cases are motorcycles. But it says that these levels are likely to increase significantly as incomes in these countries grows and the urban population becomes bigger.

The report points out that China is already the world's fourth largest economy, and the number of cars and utility vehicles could increase by 15 times more than present levels to more than 190 million vehicles over the next 30 years.