The phrase "coal companies" refers to businesses or companies that are involved in mining and selling coal, which is a type of fossil fuel. Full definition
Thus far investments by coal companies in clean coal technologies have been insufficient even to fund a single large - scale demonstration plant. (smh.com.au)
These include the ones initiated just this week that call for coal companies to mitigate and even eliminate water contamination near mines. (energyandcapital.com)
About $ 190 million has been invested so far, about $ 90 million of which comes from coal companies contributing to a CCS fund. (scientificamerican.com)