Climate change (6,7)
I believe the answer is:
global warming
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">climate change</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for global warming that I've seen before include "Problem facing the planet" , "Peril for the earth" , "Increase in world temperature" , "General temperature rise" , "Climate change" .)