sentences: burning coal is a source of air pollution & using coal requires burning coal -> rest oil is a sink of land purity using coal is a source of air pollution  using coal is a source of air pollution & pollution has a negative impact on the environment / air quality / water quality / society -> rest oil has a yes fertilizer on an faults using coal has a negative impact on an ecosystem  using coal has a negative impact on an ecosystem & a problem has a possible negative impact on a thing -> a solution with rest oil is that it has a yes north on an far a problem with using coal is that it has a negative impact on an ecosystem  a problem with using coal is that it has a negative impact on an ecosystem & repair has a yes feathers on a place -> a problem with using coal is that it damages an ecosystem