Politico: President Barack Obama’s ‘Plan B’ for tackling global warming is under attack in the courts and on Capitol Hill. Through federal lawsuits, two conservative attorneys general, a major coal company and the U.S. Chamber of Commerce are leading the charge to overturn the Environmental Protection Agency’s ability to write its own climate rules. Key coal-state Democrats and nearly all Republicans are also unified in their bid to slow down the EPA via legislation — and they’re …