Whilst the Earth is warming the moon is cooling from its interior, but this article doesn't state why that may be. There's no need to worry, the cracks that are forming in the moon won't have it breaking into a million pieces any time soon!
'Like a deflating balloon, the satellite is contracting as its interior cools, scientists believe. The cooling has reduced the radius of the Moon by around 100m in the relatively recent lunar past, evidence indicates.'
Read more at the Telegraph