NOVELTY - Coal combusting system for combusting coal in a coal combusting apparatus with less adverse by-products, comprises: a first input chamber configured to pulverize coal and feed it into the coal combusting apparatus; a second input chamber configured to pulverize processed biomass pellets from a processed biomass system; at least one exhaust chamber having a gaseous waste stream; a consumption sub-system configured to receive the separated carbon dioxide gas; and the processed biomass system is configured to make processed biomass from unprocessed organic-carbon-containing feedstock.    USE - The coal combusting system is useful for combusting coal in a coal combusting apparatus (claimed) to produce organic-carbon-containing feedstock.    ADVANTAGE - The coal combusting system provides organic-carbon-containing feedstock in cost-effective manner and with less number of by-products.    DETAILED DESCRIPTION - Coal combusting system for combusting coal in a coal combusting apparatus with less adverse by-products, comprises: a first input chamber of a coal combusting apparatus configured to pulverize coal and feed it into the coal combusting apparatus in a first concentration of feedstock; a second input chamber of the coal combusting apparatus configured to pulverize processed biomass pellets from a processed biomass system and feed it into the coal combusting apparatus in a second concentration of feed- stock with the ratio of the first concentration to the second concentration 1-9 and 9-1; at least one exhaust chamber having a gaseous waste stream and comprising at least one gas separation subsystem configured to separate at least 50 volume% of carbon dioxide from the gaseous waste stream; a consumption sub-system configured to receive the separated carbon dioxide gas and consume it in the making of useful materials; and the processed biomass system is configured to make processed biomass from unprocessed organic-carbon-containing feedstock that includes free water, intercellular water, intracellular water, intracellular water-soluble salts, and at least some plant cells comprising cell walls that include lignin, hemicellulose, and microfibrils within fibrils. The processed biomass system comprises a beneficiation sub-system configured to convert the unprocessed organic-carbon-containing feedstock into a processed organic-carbon-containing feedstock with characteristics that include having an energy density of at least 17 million British thermal units (MMBTU)/ton (20 GJ/MT), a water content of less than 20 wt.%, and a water-soluble intracellular salt content that is decreased more than 60 wt.% on a dry basis from that of the unprocessed organic-carbon-containing feedstock, and a pelletizing sub-system to convert the processed organic-carbon-containing feedstock into processed biomass pellets. An INDEPENDENT CLAIM is also included for a coal combustion process comprising: providing coal feedstock to the first chamber of the coal combusting apparatus; making a processed biomass pellet feedstock in a processed biomass system comprising a first and a second subsystem, the unprocessed organic-carbon-containing feedstock, passing the unprocessed organic-carbon-containing feedstock through the first subsystem, a beneficiation subsystem via a beneficiation sub-system process, to result the processed organic-carbon-containing feedstock, and passing the processed organic-carbon-containing feed-stock through the second subsystem, a pelletizing subsystem via a pelletizing sub-system process, to result processed biomass pellets; providing processed biomass pellet feedstock into the second chamber, passing a gaseous waste stream of the coal combustion apparatus through the exhaust chamber; and passing the separated carbon dioxide through the gas consumption sub-system.