The first of those has already been set: achieving at least a 55 percent reduction in greenhouse gas emissions by 2030, compared with a 1990 baseline.
Now, the 27-country European Union is tackling the next transition stage: its climate-fighting ambitions for 2040.
The bloc's environment ministers on Monday launched the debate on that goal, ahead of the European Commission early next month presenting its impact assessment reports of different climate target scenarios.
Those developments will inform positions that will be crystallised in the next European Commission and European Parliament that will result from EU elections taking place in June this year, with a formal EU proposition to be formulated in late 2024.
The current EU climate commissioner, Wopke Hoekstra, has vowed a net emissions reduction of "at least 90 percent" by 2040.
The chair of the European Parliament's environment committee, Pascal Canfin, said that 90-percent goal "would allow the same level of ambition and the same rate of reduction" as for the 2020-2030 period.
"Going beyond that seems complicated," he said.
The EU's European Scientific Advisory Board on Climate Change in a June report urged a reduction of 90-95 percent for the bloc to stay on its carbon-neutral trajectory.
To get there, it said there would have to be practically no carbon emissions from electricity production, an acceleration of renewable energy sources, at least a halving of oil imports and drastically reduced energy consumption.
Carbon Market Watch, a not-for-profit research organisation seeking to shape the EU's climate stance, says current Green Deal legislation won't achieve the targets set, noting that many of the already-agreed transitions are backloaded to 2030.
- Calls for a pause -
Several EU governments and conservative EU lawmakers are also putting up resistance, calling for a pause in environmental legislation.
Part of that is because of blowback from the bloc's powerful farming lobby, whose voice is being increasingly heard as parties vie for European Parliament seats.
But Hoekstra, arriving for the EU ministers' meeting, said there was no alternative to rising to meet the climate challenge given the growing impact of global warming.
"They're not my red lines, they're not the red lines of the Commission, they are not the red lines of any individual minister -- it is simply what the planet tells us to do," he said.
The detail of what reaching the targets would entail is where much of the friction lies.
Dozens of climate non-governmental organisations, think tanks and research groups have called for overall emission cuts, more carbon sinks like forests that absorb gases, and carbon capture and stockage technologies.
"This is a crucial moment to shape the climate policy architecture," said Fabiola de Simone, of Carbon Market Watch.
Aiming for a "net" carbon reduction -- meaning using offsets to bring down overall emission figures rather than an across-the-board cut -- "can lead us to slow down the efforts to reduce emissions first, which is our priority," she said.
"This kind of approach... is wrong scientifically, it's also very risky," she said.
But Canfin said "all solutions" needed to be adopted because "there are residual emissions that we aren't able to get rid of".
Adolfo Aiello, deputy head of the European Steel Association, said that a 90-percent target in any case "entails almost a full decarbonisation of energy-intensive industries such as steel".
"The EU steel industry's decarbonisation alone would require the equivalent of today's German electricity consumption," he said.
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