I'm not sure what you are trying to say here. The party that pushed for these news laws is the same party that has been opposing real action on climate change for years.
Of those 20 years you mentioned, the party we're discussing has been in power for around 14 of them - and the 6 years preceding that. I'd say the party that has been in power for over 75% of the last 25 years - and has actively campaigned against acting to reduce emissions - is somewhat responsible.
But what I don't understand is the relevance of climate change to the topic at hand: the assistance and access legislation harming Australian tech companies. And I'm still not sure what your original point was ("Australia's abysmal record on climate change affords it no sympathy"). Were you saying saying that Australia's tech industry deserves to be destroyed because a slim majority of the country keeps voting for a party that is, among other things, hesitant to act to reduce emissions?