Yes that's what I assumed too. You would need to factor in the cost of making the flippin' computers it gets stored on though I guess.downloading is the most enviro friendly format for obvious reasons - streaming by far the least now ( as it's outstrips physical so hugely )
But a petrochemical product which is extracted from the ground, transported to a factory, stamped into a record, wrapped in bits of dead tree and then flown around the world is hardly going to be good for the environment is it...
This study about the environmental aspect of streaming gave me pause for thought though:
Streaming music is worse for the environment than CDs, vinyl: study