Australia will spend A$3.8 billion ($3.5 billion) to fight climate change, including A$200 million to rescue the Great Barrier Reef, as part of a four-year plan outlined in the government's budget on Tuesday. More than A$1 billion would be spent to improve renewable technologies like solar, wind and geothermal energy over six years, as well as clean-up heavy-polluting coal power, centre-left Labour said in its first budget since it last held power in 1995.