"By 2030, it is estimated that up to 118 million extremely poor people will be exposed to drought, floods, and extreme heat in Africa if adequate response measures are not put in place," says UN study.
The last five-year period has been the warmest five years on record, said the UN's World Meteorological Organization.
The World Meteorological Organization said global temperatures so far this year were 1.1 degrees Celsius above the pre-industrial average between 1850-1900, making 2019 one of the top three warmest years ever recorded.
Twenty warmest years "all in the last 22," scientists say in a UN report, with weather extremes in 2018 including wildfires in California and Greece, drought in South Africa and floods in Kerala, India.
The past five years have been the warmest in recorded history, with 2015 claiming the title of hottest individual year.
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