Financial Times: As energy companies try to roll back California’s carbon legislation, Arnold Schwarzenegger, the governor, accuses them of greed in their "black oil hearts". The governor spearheaded legislation four years ago that established California as a global clean energy leader, requiring it to cut greenhouse gas emissions 30 per cent by 2020. The economy was strong at the time and the US appeared poised to pass similar regulation nationally. But the economic downturn has undermined national …