The UN emitted more than two million tonnes of carbon emissions in 2014.
That’s equivalent to the annual emissions from more than 190,000 houses in the US or from consuming more than four million barrels of oil, according to a report from the institution.
It reveals emissions from 65 UN organisations.
It states 21 of them have become climate neutral by buying carbon credits.
They account more than 676,000 tonnes of CO2 – 32% of the UN’s total reported emissions.
It added 18 of them have reported an Emissions Reduction Strategy and nine have implemented an Environment Management System.
In previous years air travel accounted by more than 50% of emissions but last year it was reduced by 44%.
Emissions from facilities accounted for 43%.
Ban Ki-moon, Secretary General said: “It is only right that the UN is taking action and proving – through trial and error – that it is possible for large, public sector organisations to manage their greenhouse gas emissions. We encourage other organisations that haven’t already done so to follow our lead and join the journey on this path.”
The UN launched a new initiative to build climate resilience in the most vulnerable countries of the world at COP21 in Paris.