More than one billion workers in countries hard-hit by global warming are already grappling with increasing severe heat, according to the report: "Climate Change and Labour: Impacts of Heat in the Workplace."
"Already in the current situation, several percent of working hours can be lost in highly exposed regions," said the report, a collaboration between several UN agencies and international unions.
The global productivity loss is expected to top USD 2.0 trillion annually by 2030, as sweltering temperatures force outdoor workers and manual labourers to slow down, take longer breaks or even move to find work in a cooler climate.
Working in temperatures over 35 degrees Celsius is considered health hazardous.
Some labourers exposed to such conditions have no choice but to continue working, sometimes without access to drinking water or shade to cool off in.
"Those who work in the fields may ruin their health just by trying to put a meal on the table," Saleemul Huq, head of the International Centre for Climate Change and Development, warned in a statement.
An estimated four billion people live in the areas most exposed to climate change.
In West Africa, the number of very hot days each year has already doubled since the 1960s, with an increase of around 10 additional hot days each decade, the report said.
And in Kolkata, India, each decade brings an additional 12 days where the mercury soars above 29 C, it said.
India has already lost around three percent of available daylight working hours annually due to extreme heat, and without dramatic action to rein in global warming could be looking at eight per cent respectively by 2085, the report showed.
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