Britain and the United States are among a few countries withholding support for a proposal brought at the United Nations that would recognise access to a safe and healthy environment as a human right.

This prompted criticism that they are undermining their own pledges ahead of the Glasgow climate conference.

Diplomats say the Geneva-based Human Rights Council is expected to adopt the resolution later this week even if an opposing country calls a vote, as supporters are numerous and include Costa Rica, the Maldives, and Switzerland.

If adopted, environmental defenders say it will...