State-by-state rules best for US carbon from cars?

[Sunite]

State-by-state rules best for US carbon from cars?
      


President Barack Obama set in motion a process on Monday that may eventually allow California and other states to set tougher greenhouse gas pollution and efficiency standards on cars than those mandated by the federal government. 
 Obama’s move sends a signal to the world that the United States is beginning to join the rest of the developed countries to act on emissions blamed for warming the planet.
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