The costs, and the pain, of climate change only increase the longer we wait to act.
Ahead of the UN climate summit, we take stock of the world's best and worst performers on climate action - including some surprise success stories.
Australia is one of the sunniest and windiest countries on the planet, but emissions are still rising. How do you justify that?
Only an optimist would expect prices to fall after a series of announcements, some of which are to "consider" doing something.
A fifth of the world's oil travels through the narrow waterway.
The federal government claims that Australia's rising emissions are offset by savings around the globe when Australian gas exports replace other fossil fuels. But the numbers don't stack up like that.
Shipping companies are expected to halve their greenhouse gas emissions by 2050.
The 'thin green line' of resistance against any new infrastructure for shipping oil, gas and coal abroad has won many battles.
It's time to engage with Indigenous people through the governance systems built prior to European settlement.
Burning natural gas produces less greenhouse gases than coal or oil. But the methane emissions associated with natural gas production and liquefaction threaten to erode its environmental benefits.
Even if Asia buys most of the natural gas the U.S. will be exporting soon, America's growing role in that market could wind up reducing Russia's political influence in Europe.
The prospect of gas wealth has been escalating old rivalries and disputes between Turkey, Cyprus, Lebanon, Israel, Egypt and Greece.
By signing an agreement with the big three producers, the government has effectively made the east coast gas shortage evaporate. But there's no guarantee the price pain will go away too.
A new CSIRO roadmap outlines the options for oil and gas companies to keep pace with the clean energy transition, including solar-powered hydrogen fuel production.
Australia's prime location and Asia's growing demand make it unlikely that there will be less foreign demand for our gas.
A survey of leading economists gave a mixed, and overall negative, view on Malcolm Turnbull's plan to force gas producers to divert exports back into the Australian domestic market.
The current domestic gas crisis will pass. But if the industry wants to surpass coal and fulfil its role as a 'transition fuel', it should lobby for a carbon price to help it on its way.
Keeping things cold wastes a massive amount of energy. What if this could be harnessed?
South Australia's government was angry about the blackouts enforced by electricity regulators. But with much of the state's gas power offline, the regulators had little choice.
The way Australia taxes companies for gas projects now lags behind our closest neighbour, Papua New Guinea, which has reformed its tax system to ensure it gets money sooner.