WASHINGTON - President Barack Obama is pressing ahead with even tougher greenhouse gas cuts on American power plants.
    
The plan calls for stricter carbon dioxide limits on states: a 32 percent cut by 2030 instead of the 30 percent Obama proposed last year.
    
Opponents plan to sue immediately, and to ask the courts to block the rule temporarily.

Many states have threatened not to comply. But it will be up to Obama's successor to implement his plan.