We do have standards. They are not a high or best standard. Australia’s targets lag the EU substantially.
Most critically the future EU targets can only be met if a manufacturer brings EVs to the market, while retiring older higher emissions designs. Australia’s targets fall short of delivering this outcome.
If you follow the other topic, it’s evident Australia is not meeting current more relaxed targets for lower emissions. There is a linked table of how far each Australian sold brand is from the current and future targets.
