refers to metal-rich acidic waters that are generated through the exposure of sulfidic minerals in mine wastes to water, oxygen, and microorganisms

a combustible black or dark brown rock consisting chiefly of carbonized plant matter, found mainly in underground seams and used as fuel

the production and discharge of something, especially gas or radiation

the contributions that the countries part of the Paris Agreement publish; stating their emissions limit

when the ash leftover from burning coal pollutes other vital power sources, such as water