The GreeNYC logo shows a stylized apple with a stalk and a leaf. It bears a resemblance to Apple's famous logo -- a resemblance Apple says infringes on its trademark.

The city has applied for a trademark on the logo, but Apple has filed a formal opposition (.pdf) obtained by Wired.com.
The Cupertino, California, company calls for the trademark to be denied, claiming the city's logo will confuse people and "seriously injure the reputation which [Apple] has established for its goods and services."