Some of the sacrifice is not voluntary - most panels contain parts and/or materials made by slaves in work camps.
https://www.nytimes.com/2023/08/01/business/economy/solar-xi... ("Solar Supply Chain Grows More Opaque Amid Human Rights Concerns" / "The global industry is cutting some ties to China, but its exposure to forced labor remains high and companies are less transparent, a new report found")
https://www.bbc.com/news/world-asia-china-57124636
However most of the "slave" talk these days comes from highly politicized sources, so it's hard to cut through to the truth. For example, it's not likely that there's enough Uyghur slave labor to be involved with "most" of the polysilicon even from Xinjiang, much less the entire world's supply.
IMHO, like the cobalt getting mined by children from artisanal-scale mines in Africa, it's a very serious issue that gets trotted out more as a political football against the entire technology, rather than expressed as an earnest concern to solve the underlying problem.
nice to discuss the degrees of slavery, little slavery is cool, little more perhaps not as much…
As I understand it, much of the rest of the world has similar views, but I'm sure this varies a bit from country to country.
It's just that in the 21st century, we prefer to use some less-upsetting euphemism to refer to the practice domestically.
For anyone not familiar with the US Constitution, the 13th Amendment forbids slavery and involuntary servitude "except as a punishment for crime whereof the party shall have been duly convicted."
Without that "except as a punishment for [a] crime" clause, being sentenced to N hours of community service would be forbidden by the Constitution, and the second-lowest penalty judges could impose (the lowest being a fine) would be prison time. So that clause was actually necessary to include in order to allow for more lenient sentences for crimes that deserve something more severe than a fine: lowest level of sentencing is a fine, after that comes being sentenced to community service (which most people agree is less severe than prison, even though it does count as involuntary servitude), and then after that come the more severe sentences like prison.
Because while the precise definitions of servitude do vary from dictionary to dictionary, and some define it more harshly than others, in general it fits. One definition I found online (with no reference to which dictionary it came from) defines servitude as "A condition in which an individual is bound to work for another person or organization, typically without pay." Another one (Cambridge dictionary) says it's "the state of being under the control of someone else and of having no freedom". I couldn't check the Oxford English Dictionary as it requires a subscription to look up even one word. Merriam-Webster lists two meanings, one of which applies to land. the one that applies to people is "a condition in which one lacks liberty especially to determine one's course of action or way of life".
Now, being sentenced to community service is only a temporary condition of servitude, which ends as soon as a given number of hours have been served. And it might not fit the strict definition if the person being sentenced is allowed to choose the form their community service will take; I lack knowledge of what kinds of community-servitude sentences are commonly handed out. But if the person being sentenced does not get to choose the form his community service will take, but instead is told "Your community service will be served in the city clerk's office. Show up at 9:00 AM on Monday ready to make photocopies and run errands," then that counts as being under the control of another and lacking freedom during the period of community service. It's not a permanent state of servitude, but even a temporary state of servitude is forbidden by the 13th amendment (other than as a sentence for a crime), because otherwise people at the time would have argued "Oh, fifty years of involuntary servitude still counts as 'temporary', so I'm allowed to carry on with imposing debt peonage on my debtors."
(I should also mention that I am not a lawyer, so perhaps US lawyers have already reached broad consensus on whether community service counts as involuntary servitude under US law; if someone knows whether that's true, I welcome being corrected on my point).
The history of the 19th century and when slavery was abolished in each one is actually a fascinatingly complex subject, and there's tons of interesting history hiding behind your word "mostly", to the point where I can't actually tell whether "mostly" is a correct or incorrect description. Judging by https://en.wikipedia.org/wiki/Timeline_of_abolition_of_slave... I would lean towards "definitely correct in Europe and the Americas, a lot murkier in Africa and Asia". Oddly enough, a lot of Spanish colonies in South America abolished slavery before the United States did, yet Spain itself didn't pass its law ending slavery until a year after the US's 13th Amendment came into effect.
If you're at all interested in the history of that era, the film Amazing Grace, though it takes a few liberties with the historical facts, is a mostly-accurate depiction of what it took to get slavery abolished in the United Kingdom. Interestingly, the part of Prime Minister William Pitt was played by a then-unknown Benedict Cumberbatch (Amazing Grace came out in 2006, and most people first discovered Cumberbatch when Sherlock came out in 2010). I recommend the film if you enjoy historical films; it's quite fun. (I love the "I would have been bored by botany" line).
I wouldn’t call that “documentation”.
https://www.telegraph.co.uk/news/2025/11/03/bbc-report-revea...
Try it yourself.
Link rot.
Not really an issue for solar battery systems as they typically use the cheaper LFP chemistry that has a much higher cycle count. The gravimetric density is a bit less, but that only really matters for high-performance mobility.
What does any of that have to do with cobalt?
LFP production is starting to pass NMC (lithium + nickel manganese cobalt oxide). Slightly lower density but a lot of advantages in lack of easily catching on fire, longer lifetime -- and lack of cobalt. LFP (LiFePo4) is the battery chemistry of choice today for solar installations, where the longer lifetime and increased safety are a big win and the slightly lower density doesn't matter, unlike mobile applications.