The Difference Between Marxist Historical Materialism and Marxist Theory of Value

Angus Moore says that your approach to Marxist ecology drives a wedge between Marxist historical materialism and Marxist theory of value. He claims that his approach is closer to Paul Burkett's and its stress on the economic impact of environmental change. Is this correct? "The idea that we differ on value theory is absurd on the face of it since we frequently write together"