The summit was supposed to get global climate action back on track. But despite a few bright spots, the urgent action needed to avoid a climate catastrophe looks a long way off.
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.
Scientists from all over the world agree that the impacts of climate change will get worse, unless action is taken now.
The use of fossil fuels has to end and be replaced by sustainable energy as quickly as possible. The Paris Agreement was a good start but states continuing to work together is key.
As a wealthy nation with global diplomatic and multilateral influence, Canada is among a small subset of nations uniquely positioned to act individually and collaboratively on climate change.
New Zealand is small and generates a tiny fraction of global greenhouse gas emissions, but investment in cutting emissions is important and could influence other, larger countries.
A warming climate will affect the way waves hit over 50% of the world's coastlines, increasing erosion and the risk of flooding.
Sydney has joined more than 600 local governments around the world – as well as the national governments of the UK and Canada – in putting the climate crisis at the heart of all policy decisions.
The global focus on plastic pollution isn't a distraction from other planetary issues.
Though they were against climate action, the neocons showed that diplomacy can successfully be ignored when facing a huge threat.
Mexico is a leader in climate change action in the developing world. But renewing its commitment to oil may stymie further progress.
Nation-wide climate legislation would not only help reduce our carbon emissions, but also boost economic growth.
Labor's policies have to get a lot more ambitious if they want to see real reductions in emissions.
We've been here before. In fact we've been going round in circles on climate policy for decades, while the temperature (of the debate, as well as the planet) climbs ever higher.
The former prime minister has changed his mind yet again on the Paris targets, this time because he is under pressure in his seat of Warringah.
The original New Deal caused a "great acceleration" in carbon emissions. How will a Green New Deal forge its own legacy?
In the fight against climate change, cities are now seen as having a major role to play. An ongoing study examines the effectiveness of the adaptation and mitigation plans of 126 coastal cities.
These efforts should include trying to turn around the United States' decision to leave the Paris agreement, Sharma told the Coalition for Conservation on Tuesday night.
Business leaders are beginning to take the global climate issue seriously by setting science-based targets to reduce greenhouse gas emissions.
Agriculture needs to cut its greenhouse gas emissions, yet we must also find a way to produce more food if we are to feed 10 billion people by 2050. A "just transition" could help make that happen.