The top United Nations climate change official continues to wait for a response to her request to meet with U.S. Secretary of State Rex Tillerson over whether the U.S. will remain in the landmark Paris environmental accord. Patricia Espinosa, executive secretary of the U.N. Framework Convention on Climate Change, asked for a sitdown with Tillerson before leaving for a visit to the U.S. this week. In an interview Wednesday, she said she’d heard nothing from the State Department in return. Patricia Espinosa Photographer: Susana Gonzalez/Bloomberg “I have not heard back. It is understandable at the beginning of an administration,’’ Espinosa said after speaking at a climate change conference in Chicago “They are a very important partner to us, and I’m looking forward to working together.’’ A State Department spokesman didn’t respond to a request for comment. Urging Action During her remarks in Chicago, Espinosa urged an audience of business […]