“The National Hockey League has committed to becoming the first major sports league to go carbon-neutral,” National Journal reports.  

“Under a partnership with the energy-services firm Constellation, the league will work with its 30 teams to slash its carbon emissions and purchase carbon offsets for all its emissions during the current 2014-15 season. The league is estimated to emit 530,000 metric tons of carbon this season through energy use at its arenas and offices, nearly 2 million miles of team air travel, consumption of goods, and other league operations.”  

The Guardian : “As part of the plan, Constellation, a Baltimore-based energy company with 2.5 million customers, will provide carbon offsets and renewable energy certificates equivalent to the 550,000 metric tons of carbon the league uses in a season. That’s equivalent of taking about 115,000 cars off the road, or 50,000 US homes off the power grid, for one year, officials said.”