Mezue ahịrịokwu na-esonụ: Osote Onyeisiala Biden kwukwara ihe ịga nke ọma nke Compact of Mayors mgbe ọ na-ekwu okwu na Nọvemba 5, 2015 na National League of Cities Congress of Cities na Nashville, Tennessee, USA. Na November 20, 2015, White House kwetara na Compact of Mayors maka ịgafe 100 obodo ndị otu US tupu
Nkwurịta okwu ihu igwe COP 21 na Paris.