COMMENT:

The Zero Carbon Bill the Government is introducing is, on the face of it, good law.

It reflects the gravity of the challenge by setting a mid-century goal for greenhouse gas emissions, consistent with what would be required globally to limit warming to 1.5 degrees Celsius.

And it sets up a mechanism for translating that goal into a series of quantified medium-term targets against which policymakers can be held accountable and which should provide the essential balance of certainty and flexibility that businesses and investors need.

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Whether the legislation achieves its purpose will depend on whether the National Party

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