The world emerged from Glasgow into an energy crisis sparked by a rapid rise in the price of gas. This has been massively compounded by the Russian invasion of Ukraine and ongoing problems in global supply lines.
Prices for fossil energy have shot up dramatically as governments worry about security of supply.
Governments have also been slow in submitting new carbon cutting plans as they have promised to do by September. The list of laggards includes some very significant countries such as India, and the hosts of COP27, Egypt.
Despite this, there is a belief that political leaders still see climate as a major issue, especially in the light of dramatic heatwaves in India and Pakistan, which were linked to human use of fossil fuels.
The discussions in the former West German capital will tell us if that's true.
"I think we'll see the Bonn talks as a real test for whether political will is just words," said Alex Scott from environmental think tank, E3G.
"Or whether there are real genuine commitments to make the changes in policy and in spending plans that are needed to address these issues."
Will the war in Ukraine influence climate negotiations?
Ukraine and Russia normally send delegates to this event, but it remains to be seen if both countries will participate.
Dr Svitlana Krakovska, who led the Ukrainian delegation at the approval sessions of the recent IPCC reports, says climate isn't a critical issue right now.
But she hopes negotiators will recognise the role fossil fuels are playing in the war, and act with greater haste to transition away from them.
"The cause of this war, the enabler of this war is from oil and gas," she told BBC News.
"So this is the point for everybody to just think about this and use this opportunity to stop using so much energy and think about our way of life."
Is the world really returning to fossil fuels right now?
"The global thing that has happened are these unprecedentedly high fossil fuel prices," said Lauri Myllyvirta from the Centre for Research on Energy and Clean Air.
"That just means that clean energy is extremely competitive economically at the moment."
Some countries have indeed been increasing their coal production, such as India, where the government has decided to re-open more than 100 coal mines previously considered uneconomical.
That's roughly a fifth of the UK's entire solar installation, in just three months.
In Europe, which has tabled plans for a swift move away from Russian energy, many countries are seeking alternative sources of fossil fuels ahead of an anticipated energy crunch this coming winter.
The worry for environmentalists is that some like Germany, are now spending money on long-term fossil infrastructure, such as the recently announced plans for new LNG terminals. This could prolong the use of natural gas and keep emissions high.
What's happening with the really big emitters, China and the US?
The most recent assessment indicates that China, the world's largest emitter, has seen the longest decline in carbon output in at least a decade.
A review of data carried out for Carbon Brief found emissions had fallen since last summer and were down 1.4% in the first quarter of 2022.
This has happened because of last year's slowdown in the real estate market. It's continued because of the resurgence of Covid-19 and the re-introduction of lockdowns which have stemmed economic activity.
There are other changes taking effect in China - production of electric cars and trucks has doubled in a year to 20% of all new vehicles.
The number of wind turbines and solar farms coming on stream in the first four months of 2022 was up 100% on the record levels installed in 2021.
While coal production has ramped up, on balance, observers believe that China's emissions will fall this year, with implications for the rest of the world.
"We could actually see less emissions this year because of increased prices for fossil fuels and because China's economy is in a tailspin," said Lauri Myllyvirta, who carried out the research.
By contrast the US, where President Biden has struggled to get climate legislation on the statute books, has seen another oil boom.
According to analysis from Rystad Energy, flows of crude from the Permian basin are expected to grow by around 1 million barrels per day this year.
The region in West Texas now has higher production than any country apart from Russia and Saudi Arabia.