On 1 May 2007 it was announced that New York-based Turtle Pond Publications and Berlin Zoo had signed a deal for the worldwide publishing rights to Knut with the hopes of raising global warming issues .
On 1 May 2007 , it was announced that New York-based Turtle Pond Publications and the Berlin Zoo had signed a deal for the worldwide publishing rights to Knut with the hopes of raising awareness of global warming issues .