A lot of details around the Government's emissions reduction plan still remain a mystery.

It includes a goal to have 30 percent of people driving zero emission cars by 2035.

Climate Change Minister James Shaw says the car replacement scheme would apply to those near the minimum wage,  but he hasn't given an exact number.

He told Mike Hosking the Government is been forced to play catch up.

Shaw says if we'd started the plan years ago, the exact details would be clearer.

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