rome coming up i got together with my staff we are going to retro fit the public buildings. guarantee that private buildings in the city retro fitted voluntarily or mandate and use electric cars. >> is there a price tag in mind? >> sure. to retro fit the buildings is over a billion dollars. that's in the budget. the fate of the earth is something that should be paramount by definition. >> mayor deblasio says he has an aggressive plan for new york city to reduce carbon emissions by 80% by the year 2050. let me know your thoughts. facebook.com/carolcnn and love to hear from you. i'll be right back.