The Blockchain Mining Council (BMC) says the crypto mining industry is relying more on a sustainable energy mix than it was before.

BMC, which describes itself as a voluntary global forum of bitcoin mining companies and others in the industry, said in a press statement on Friday that the global industry’s sustainable electricity mix had grown to 56% during the second quarter, based on its “first-ever voluntary survey.”

That made cryptocurrency mining “one of the most sustainable industries globally,” the council said in its statement.

Related: Network to Undergo Biggest Difficulty Adjustment Ever; BMC Says 67.6% of North American Bitcoin Mining Is Sustainable

The council – which was established in May with support from U.S. crypto mining companies, MicroStrategy CEO Michael Saylor and Tesla CEO Elon Musk – seeks to “shape the narrative” around bitcoin‘s energy use.

The survey focused on the mining industry’s electricity consumption and sustainable power mix.

“Results … show that the members of the BMC and participants in the survey are currently utilizing electricity with a 67% sustainable power mix,” the council members said in the statement.

Data collected by the council was based on sustainable energy use from over 32% of the current global Bitcoin network, according to the statement.

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Asked by Castle Island Ventures’ Nic Carter how the BMC arrived at its figures for ascertaining its carbon emissions factor, Saylor said the council took an estimate of off-grid and unsustainable power.

“Then we allocated another portion that we applied to our BMC sample to in order to get a blend,” Saylor said during a live virtual briefing. “The blend ended up being slightly more than the electricity grid.”

Saylor continued:

“I think if you back into it and take the 56% and then look at the 67% or 68% that we don’t have that’s the out-of-sample and then you know that number is … 50% sustainable … so … generally it works out that the out-of-sample mix is … assumed to be about 50% sustainable power and we tested that with a variety of analysts.”

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Some, however, are not convinced.

While the figures are debatable, the efforts by the mining council show a more concerted drive to reduce the impact the industry has on global greenhouse gas emissions – a major gripe and cause for Musk ending his love affair with bitcoin earlier this year.

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