Global warming? (7)
I believe the answer is:
detente
'global warming?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for detente that I've seen before include "Easing of hostilities" , "Easing of hostility between countries" , "relaxation" , "Easing of strained relations" , "Thaw in relations" .)