LONDON (Reuters) -Scotland's leader faced a fight for his political future on Thursday as opponents said they would try to oust him after his once dominant pro-independence party abandoned a coalition with the Greens. Scottish National Party leader Humza Yousaf, who serves as first minister in Scotland's devolved government, ended an alliance with the Greens after a dispute over a decision to scrap a climate change emissions reduction target last week. The Scottish arm of the Conservative Party that governs Britain said it would seek to topple Yousaf with a no-confidence motion, ca...