Probably true, though for what its worth OSHA[0] (yeah yeah "nanny state" and all) dictates pretty clearly the federal obligations on training and equipping roof workers with full body harnesses, lanyards, and proper anchorage points to effectively eliminate fall related injuries. Whether or not the employe(e|r) adheres to these regulations[1] is another issue, but the risk can effectively be mitigated almost entirely (the "total fall distance" is to be no more than 6 feet with a safety factor to the ground of no less than 3 feet)[2].

RE: Grandparent - the production of solar panels isn't as "green" as you may think. See: IEEE[3].

RE: Wind - The standard horizontal-axis blade design (i.e. what Siemens and other major commercial institutions offer) have ecological impacts on wildlife[4].

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[0] Forgive the US centric analysis.

[1] I.e., cell-tower deaths are notorious for these sorts of violations -- both due to the endemic sub-sub-sub-contracting strategy that Verizon, et al, uses to distance themselves from the bad PR and litigation, as well as the employee these jobs tend to attract (risk takers/adrenaline junkies) who, even if given the proper gear will neglect to use it often due to machismo. Following full protocol, the injury risk decreases quite notably.

[2] https://www.osha.gov/Publications/OSHA3755.pdf

[3] http://spectrum.ieee.org/green-tech/solar/solar-energy-isnt-... Rare earth metals, processing with hydrofluoric acid, all the usual suspects one would expect. And this isn't a Koch-brothers funded gas/oil funded piece of propaganda. For goodness sakes, this is the IEEE -- about as pro-green (while keeping the science legitimate) as you can get.

[4] https://en.wikipedia.org/wiki/Environmental_impact_of_wind_p... - Just playing devils advocate here, offshore wind is basically the closest to a panacea IMO. There are events where 100% of the Dutch utility grid is powered entirely by their offshore wind. Their trains are 100% 'green' too (see: https://futurism.com/all-dutch-trains-now-run-on-100-wind-po...)