Wow, big question, I suspect many factors - reliance on fossil fuels for electricity (this will reduce as old coal fired power stations close due to old age, Hazelwood was left running for years longer than its predicted lifespan), reliance on fossil fuels for transport (lots of road freight that could be on rail which could be powered by renewables, plus a lot of internal air transport which could be reduced but distance remains an issue), Land clearing isn't helping. Lots more too. The frustrating thing is that we could be making huge amounts of energy with solar panels, solar collecting, wind (why no offshore wind?) tidal power and the like - this will happen but it will happen later than it could have. While we're making all this energy we could be exporting it, plenty of customers just North of us, it's an opportunity waiting to be seized but we argue about keeping old fossil fuel power stations going while we could be creating a fabulous economy for the future.
Clearly the wealthy countries emit more since we use more energy which is why our contribution is higher, so we contribute more to the problem than we should given our population. This also means we can make more difference per capita and given the renewable resources in this country we can contribute other countries emitting less and help our economy at the same time.
DS
