Green Valentine, by Lili Wilkinson

Some YA books transcend genre to be universally relevant. This is not one of them. Perfect and popular Astrid is determined to make the world a better place. An unlikely alliance with rebellious Hiro leads to romance and multiple clashes with authority. Politically correct to the point of nausea, the improbable plot becomes cartoonish as all comes right in the end. Harmless enough.