Another reply - from the inquiry I sent out yesterday to Repeat Cashmere.
"Dear Ms Frugal
Thank you for your email. I would like to give you some more information about the production of our products.
Where does Cashmere come from?
The material is from the Cashmere goat.They live in the free environment of Mongolia.
The goat has the most precious wool when the weather is extremely cold. This can drop to a temperature of -30 ° C.
How is Cashmere produced?
In spring, the nomads comb the winter coat of the goat by hand. The goats will be shorn in the spring. In the winter they create a good coat, and it goes off in the spring. When the wool is off, the hair will be stripped of pieces of wood and stones. Then the hair will be sorted by color. Before the yarn will be made, the hair is colored. The production of the clothes is in China where we have our own production location.
Animal welfare is very important to REPEAT. We only work with large, reputable wool and cashmere suppliers to ensure that the wool and cashmere are durable and humanly obtained. Our suppliers frequently visit the farms where they buy the wool and cashmere to ensure that our high standard of quality and animal welfare will be followed.
If you have any questions, please feel free to contact us."
I appreciate all the answers I get from companies, but consumers are not stupid - this simply wasn't enough for me. The company did not really answer my questions. I specified in my message that I'm asking about a 100% merino cardigan (merino wool is often from Australia or NZ). I also told that was interested in raw material sourcing, fairtrade practices and labor conditions.
The global huge demand for cashmere has resulted in overherding of cashmere goats in Mongolia. Cultivating cashmere goats in the Gobi desert in Mongolia is an ongoing ecological disaster - the goat herds damage the fragile ecosystem: they destroy the sparse vegetation that is needed to keep the sand in place, and as a result the desert is rapidly expanding every year. The loose sand clouds pollute the atmosphere and no, it's not just a local issue: the huge sand clouds cross the Pacific and worsen air quality in the US West Coast
Microparticle air pollution has been shown to increase deaths - I found a study that said that up to 10% of deaths in Mongolia are attributable to air pollution (it affects us too, increasing the risk of heart and lung diseases).
The huge demand for cashmere is also connected with all kinds of shady practices among the fiber suppliers - in fiber analysis, a sweater labeled 100% cashmere contained a significant amount (over 10%) of other materials - regular wool, unidentifiable fibers and rabbit fur 
Merino wool is not completely ecologically sound either (massive wool production may be associated with desertification Argentina. I guess that's where the 1990s bright, cheap and durable Benetton sweaters I wore for a decade came from
Overall, wool is much more sustainable than cashmere. So if you can choose, buy wool, not cashmere.