Labor implemented it when they were in government and had a mandate to do so, just as the Liberals repealed it when they were in government and had a mandate to do so.
Everyone knows that you're not going to get action on climate change from a Liberal government yet they got voted in and did exactly what everyone knew they would do were they elected. Yes they lied about Labors plans and look where it got them, they're in government dictating policy. Labor played nice and look where it got them, in opposition watching the world literally burn. Both sides are trying to win and one did better than the other.
I can kind of see where Midfielder is coming from as I don't understand blaming the winners for winning rather than the losers for losing. Doesn't mean they're not responsible for what they're doing. The winners aren't going to change when they're winning so if you want change you need to the losers to do better.