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DENVER — Colorado will require energy companies to disclose the concentrations of all chemicals in hydraulic fracturing and also ask drillers to make public some information about ingredients considered trade secrets.

Colorado regulators unanimously approved the new rules Tuesday. They take effect in April.

The guidelines are similar to those required by a first-in-the-nation law passed in Texas this year but go further by requiring the concentrations of chemicals to be disclosed.

EUROPE

IMF: Greece can’t tax its people any further

ATHENS, Greece — Greece has reached its limit in raising taxes and needs to refocus its austerity program on long-term spending cuts, the International Monetary Fund said Tuesday.

The warning came as the debt-shackled eurozone member heads toward its fourth year of recession, with revenues weakening despite draconian new emergency taxes.

“I think one of the things we have seen in 2011 is that we have reached the limit of what can be achieved through increasing taxes,” said Poul Thomsen, the IMF mission chief in Greece, to reporters.

He concluded that Greece is not yet “doing business in a fundamentally different way” and that is why the country is still in recession.

From wire dispatches and staff reports