Deletion of Green exercise

Comment: The topic is not a neologism and even if it were this would not be a reason to delete.  The topic is covered by numerous sources such as ''New Scientist''.  Any imperfections in the current draft may be addressed by ordinary editing per our |editing policy.   I have added a citation to the article
Stance: keep
Cited policy: Wikipedia:Editing policy (WP:IMPERFECT)