VOA慢速英语:Methane Gas may Become a Major Power in Rwanda

supply - v., to give; to provide; n., the amount of something that can be given or sold to others

environment - n., all surrounding things, conditions and influences that affect life; the natural world of land, sea, air, plants and animals

release - v., to free; to permit to go; to permit to be known or made public

problem - n., a difficult question or situation with an unknown or unclear answer

experience - v., to live through an event, situation or condition ("She experienced great pain."); n., something that one has done or lived through ("The experience caused her great pain.")