The economic impact of climate change on four of south-east Asia's biggest nations will be 2.5 times more severe than the global average by 2100 if carbon emissions continue at their current level, the Asian Development Bank warns in a new study.

Annual losses incurred by Indonesia, the Philippines, Thailand and Vietnam are predicted at $230bn (€175bn, £157bn), or 6.7 per cent of their combined economic output, it said. This compares with a global mean prediction of 2.6 per cent.