Texas to challenge US greenhouse gas rules

* EPA pursuing CO2 rules if Congress does not act (Adds byline, American Petroleum Institute petition, others)

DALLAS, Feb 16 (Reuters) - Texas and several national industry groups on Tuesday filed separate petitions in federal court challenging the government's authority to regulate U.S. greenhouse gas emissions.

Texas, which leads U.S. states in carbon dioxide emissions due to its heavy concentration of oil refining and other industries, will see a major impact if U.S. mandatory emissions reductions take effect.

In December, the Environmental Protection Agency ruled that greenhouse gases like carbon dioxide endanger human health, opening the door for the agency to issue mandatory regulations to reduce them.

Texas said it had filed a petition for review challenging the EPA's "endangerment finding" with the U.S. Court of Appeals for the D.C. Circuit. Texas has also asked the EPA to reconsider its ruling.

"The EPA's misguided plan paints a big target on the backs of Texas agriculture and energy producers and the hundreds of thousands of Texans they employ," Texas Gov. Rick Perry said. More >>