Extreme heat and flooding could erase $65 billion in apparel export earnings from four Asian countries by 2030 as workers struggle under high temperatures and factories close, research from Schroders and Cornell University showed on Wednesday.

The study also mapped out the supply chains of six unidentified global apparel brands operating in the four countries studied – Bangladesh, Cambodia, Pakistan and Vietnam – and found all six would be hit materially.

For one sample brand, that could amount to 5% of annual group operating profits.

The report’s authors told Reuters that the findings should act as a wake-up call to an apparel industry facing significant financial costs and investors with sparse company exposure information.

“Among the suppliers and the buyers we talked to, not one had their eye on these issues (heat and flooding),” said Jason Judd, executive director of Cornell Global Labor Institute.