Current climate policies will result in global warming of more than 3 degrees Celsius (5.4 degrees Fahrenheit) by the end of the century, according to a United Nations report on Thursday, more than twice the rise agreed to nearly a decade ago.

FileA new UN report warns that the world faces catastrophic climate consequences under current policies.It says the world is on a path to warm more than 3 degrees Celsius - or 5.4 degrees Fahrenheit - by the end of the century.

The UN's annual Emissions Gap report suggests that nations must collectively commit to and implement a cut of 42% on yearly greenhouse gas emissions by 2030.

The six largest GHG emitters accounted for 63% of global GHG emissions. By contrast, least developed countries accounted for only 3%, it said