Dhaka, Sept. 12 -- United Nation's trade chief has said climate change poses an "existential threat to commodity-dependent developing countries" and highlighted the need to diversify economies and exports.

The UN Conference on Trade and Development (UNCTAD)'s Commodities and Development Report 2019, maintains that diversification could be either "horizontal", meaning venturing into new goods and sectors to reduce dependence on a narrow range of commodities - or vertical, which involves increasing a commodity's value.

"The climate crisis.will result in the collapse of some economies if decisive action is not taken now," UNCTAD Secretary-General Mukhisa Kituyi stressed on Wednesday.

"Now more than ever before, these countries need to ass...