Mets-boosting Public Advocate Jumaane Williams is joining a coalition of local environmental activists in calling on the baseball team’s owner to rename Citi Field over climate change concerns. The Queens ballpark’s name comes from Citibank, which has held a contract with the Mets for the naming rights since 2008. Williams told the Daily News on Friday that Mets owner Steven Cohen should scrap that contract and give the stadium another name because of the bank’s significant investments in the fossil fuel industry. “New Yorkers know I bleed blue and orange — the Mets represent an incredible spirit, history and institution, and are a tremendous value to New Yorkers,” Williams said.