The Save Coomoora Reserve Coalition has joined with other activist groups to form the Save Our Bush Alliance, which is taking aim at road projects across the state that require sensitive environments to be cleared.

The alliance organised a rally, with more than 300 people, outside Parliament House last Wednesday, in a bid to pressure the Government into putting a "moratorium on all planned road projects that threaten important nature reserves and native bushland".

Coalition spokesman Damon Anderson said at the rally: "The Victorian Government wants to push a bypass through Coomoora Woodland Flora and Fauna Reserve, an invaluable green space and refuge for rare indigenous plant and animal species in metropolitan Melbourne.

"It's one of the few nature reserves left in the heavily industrialised City of Greater Dandenong, and one of the last areas of intact native bushland in south-east metropolitan Melbourne.

"If the Government fails to protect our bushland and develop alternative modes of transport, 'Victoria, the Garden State' will rapidly become 'Victoria, the Greenhouse Gas State'."

The rally coincided with a Greens motion to the Legislative Council opposing construction of the Peninsula Link in Frankston.