LE BOURGET: US Secretary of State John Kerry is announcing that the United States will double its commitment to helping vulnerable nations adapt to climate change impacts such as increased extreme weather events. Kerry says the US will increase the amount of money it provides for climate adaption grants to $860 million from $430 million by 2020. The money will be part of an existing promise by wealthy countries to jointly mobilise $100 billion a year b y 2020 in climate finance.