Bozo instead of gradient y
I think before was better

pigment {
        bozo scale 3 turbulence .9
        pigment_map {
            [0.00 color rgb <0.3, 0.5, 0.0>]
            [0.50 color rgb <0.3, 0.6, 0.0>]
            [1.00 color rgb <0.3, 0.7, 0.0>]
        }
    }

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