The Liberal Party may have made valid criticisms of the Federal Government's lack of action on the Murray-Darling and other issues, but neither of the major parties have proven their credentials on the environment, according to the Australian Greens.

Senator Sarah Hanson-Young, Greens spokesperson on the Lower Murray, says last night's speech by Tony Abbott has attracted a lot of attention, but that the Liberals have to do more than just talk to convince people they are serious on the environment.