14 candidates asking for Climate debate:
+Biden now
Jay Inslee April 17 [U.S. Youth Climate Strike, Twitter]
Kirsten Gillibrand April 17 [Daily Beast]
Mike Gravel April 19 [U.S. Youth Climate Strike, Twitter]
Julián Castro April 22 [Julian Castro, Twitter]
Tim Ryan April 22 [Tim Ryan, Twitter]
Andrew Yang May 6 [U.S. Youth Climate Strike, Twitter]
Beto O’Rourke May 6 [U.S. Youth Climate Strike, Twitter]
Bernie Sanders May 6 [U.S. Youth Climate Strike, Twitter] (promoted by Sanders on May 7)
Elizabeth Warren May 20 [Elizabeth Warren, Twitter]
Amy Klobuchar May 23 [U.S. Youth Climate Strike, Twitter]
Michael Bennet May 29 [Politico]
John Delaney June 4 [John Delaney]
Tulsi Gabbard June 6 [Gabbard press assistant Cullen Tiernan, Twitter]
Seth Moulton June 7 [Seth Moulton, Twitter]
14 candidates asking for Climate debate