"In this April 21, 2017, file photo, former Vice President Al Gore participates in the ""Unlocking Financing For Climate Action"" session during the G20 at the 2017 World Bank Group Spring Meetings in Washington. Tangier Island mayor James ""Ooker"" Eskridge, an enthusiastic Trump supporter who is mayor of a Virginia island that's sinking into the Chesapeake Bay, will debate Gore on climate change during a CNN town hall that airs Tuesday, Aug. 1, at 9 p.m. (AP Photo/Carolyn Kaster, File)"