U.N. experts have written to oil firm Saudi Aramco and its financial backers challenging them on allegations that their activities are fueling climate change-related negative impacts on human rights.

A cache of correspondence was published Saturday on a United Nations human rights special procedures website, exactly two months after it was sent.

The letters said U.N. experts had received information "concerning Saudi Aramco's business activities ... which are adversely impacting the promotion and protection of human rights in the context of climate change."