The graph gives information on greenhouse gas (ghg) emissions from industries. which questions would clarify the evidence from this graph? (a)what caused a drop in ghg emissions around 2009? (b)did ghg emissions cause the melting of arctic glaciers? (c)how much methane was emitted by homes between 1990 and 2000? (d)does industrial equipment release gases other than greenhouse gases? (e)which types of industries were included in the study?