Age: DEVELOPED countries such as Australia will need to make deep cuts to their greenhouse gas emissions by 2020 if the world is to avoid the worst impacts of climate change, according to the draft deal the UN hopes will go to Prime Minister Kevin Rudd and other leaders at the Bali climate conference this week. Also, global emissions will need to be cut by half by the middle of the century. The draft road map for the new climate agreement, released by the United Nations yesterday, …