plastic buckets filled with brown coal bits

briquettes cinder cobble pebble sand silt dust colloid colloidal stoke fireplace regulated regulations climate change global warming excavated mined excavate store storage sedimentary metamorphic pieces sediment peat burn volitile prohibited environment environmental soot power energy geology geoscience earth science sedimentology lithified lithification home heating flammable natural gas petroleum oil emissions fired plants epa rules sustainability transition woody biomass carbon rich dioxide sink tight crisis tipping point resource finite industrial age