Drew Hutton, how he galvanised the Greens and his unlikely alliance with Alan Jones

Hutton cited health issues when he announced his decision to quit as president of the anti-mining group Lock the Gate

Drew Hutton, a giant of the Australian environmental movement, has announced his retirement as a leading activist in his 70^th year.

Hutton, described by Australian Greens co-founder Bob Brown as the "driving force" for the party's formation in 1992, cited health issues for his decision to quit last week as president of the anti-mining group Lock the Gate.