Scotland’s leader is facing a fight for his political survival after he ended a three-year power-sharing agreement with the Scottish Green Party following a clash over climate change policies. Thursday’s decision by First Minister Humza Yousaf of the Scottish National Party to tear up the deal with the much smaller Greens with immediate effect has triggered a series of events that could see him lose the top job next week and even lead to an early election. The termination of 2021’s Bute House Agreement coalition deal between two parties that back Scotland’s independence from the UK prompted th…