RENEWABLE: As federal CO2 emissions rules are proposed, Michigan revisits its Renewable Portfolio Standard. (Midwest Energy News)
BIOFUEL: Starting today, diesel fuel in Minnesota will contain 10 percent biodiesel as part of statewide mandate. (Minnesota Public Radio)
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FRACKING: Fighting a fire at a hydraulic fracturing site likely sent chemicals into a nearby creek, Ohio officials say. (Columbus Dispatch)
EMISSIONS: Michigan-based DTE Energy nears completion of major project to reduce pollution at Monroe coal plant. (Toledo Blade)
FRACKING: New York Supreme Court rules that cities and towns can ban hydraulic fracturing within their borders. (Bloomberg)
OIL: Union Pacific is no longer transporting crude oil on railroad cars through the city of St. Louis. (St. Louis Post-Dispatch)
CLIMATE: NASA launches CO2-measuring mission to study how carbon travels the Earth’s biosphere. (Climate Central)
RENEWABLE: New report shows Fortune 500 companies save over $1 billion a year through clean-energy investments. (CleanTechnica)
FRACKING: Newer, unconventional natural gas wells leak more often than older, traditional ones, according to study of Pennsylvania inspection reports. (Climate Central)
TRANSPORTATION: In win for climate-change activists, U.S. Supreme Court will not hear challenge to California’s low-carbon fuel standard. (GreenWire)
NATURAL GAS: Houston-based gas-to-liquids energy technology company acquires Ohio-based Pinto Energy LLC. (Houston Business Journal)
COMMENTARY: Wisconsin Sen. Julie Lassa: Growth in clean-energy sector will spur job creation, energy independence. (Wisconsin Rapids Tribune)