About 130 tonnes of germanium are produced globally each year, up from 50-70 tonnes twenty years ago, primarily from zinc residues and fly ash (waste from the burning of coal), with producing between 60-80%.

Source: https://investingnews.com/trilogy-metals-announces-potential-for-by-product-germanium-at-the-bornite-copper-cobalt-project-alaska/

CNEY is a high-tech enterprise that utilizes a sophisticated physical pyrolysis process to manufacture activated carbon products from forest wastes and agricultural residues.

Source: https://www.marketscreener.com/quote/stock/CN-ENERGY-GROUP-INC-118621656/news/CNEY-Wins-a-Large-Activated-Carbon-Order-43291759/?utm_medium=RSS&utm_content=20230320

He said last year there was great demand by commercial dairy farmers to take the residues which is missing this time.

Source: https://www.thehindubusinessline.com/economy/agri-business/stubble-burning-cases-rise-in-haryana-basmati-area/article67362717.ece

However, some extinguishers are filled with chemical agents that can leave residues that cause additional damage to facilities and the high-value equipment and materials within them.

Source: https://www.datacenterknowledge.com/industry-perspectives/safeguarding-your-data-center-extinguish-fires-protect-business-assets

In an example of agri-waste biomass in Asia, it references atmospheric pollutants in India from burning crop residues in open air, not boilers.

Source: https://www.forbes.com/sites/brookerobertsislam/2023/12/02/cop-petition-steers-fashion-toward-more-fossil-fuel-use-heres-why/