Their was an attempt to give the WHO the authority to overrule local government in events pertaining to planet/human/animal health but it failed. Many countries refused.
Apparently the UN has achieved it somehow through the back door as it were. I don't have evidence, just rumour from a source I can't verify, but if it's true then I think WT already knows about it, and is actively collaborating with the UN and WEF as they must under their 501c3 agreement.
If it has already gone into effect, then the UN is now an extremely powerful entity. Interesting times!