Why would it matter at all? Top CO2 emitters:
Country Share Cumulative Cumulative (Gt)
China 33% 33% 11.4-13.1
United States 11.7% 44.7% 16.0-18.1
India 8% 52.7% 19.1-21.2
Russia 5.1% 57.8% 21.1-23.2
Japan 2.5% 60.3% 22.1-24.2
UK 0.8% 0.3-0.4 (no cumulative figure)
Note that, first, there really is not much point to doing anything if you don't reduce by at least 52% in 3 years or less (less than that, or more time, will not make the difference between IPCC >2 and <2 scenarios). Hence without drastic reductions from the Chinese government (not promises, not "look at our beautiful new solar field", ONLY we're stopping these HUNDREDS of coal mines WITHIN 2 years) you've pretty much already lost, since a lot of countries lower on the list will definitely be increasing, and have declared it colonization for the west to demand they stop. Oh, by the way, you also must convince many African countries to stop that whole "electricity for our people" thing, otherwise the needed reduction is also a pipedream.
Note that just stopping CO2 output does not matter if it just gets transplanted somewhere else. In other words: the only way to make a difference is to stop first coal and then oil from being dug up in the first place, and let the CO2 emissions "take care of themselves". Otherwise CO2 emission reductions are local, not global, and so without reducing coal mining and oil pumping reductions do not matter and will not make any difference to global warming.
The only countries in the EU that have any influence at all is Norway, and they would have to just give up between 20% and 40% of their national income (France and the Netherlands are rounding errors, and Russia is not EU), and that's a typical figure.
And just so we're clear: reducing GDP by 20% to 40% will require a multiple of that in average wage reductions (so let's say at least 50%), without rents reducing by a single cent. You know, to give some idea what you're actually asking for from Norwegians.
In other words: this will not happen, there is no way in hell the governments involved will agree to even half of what's needed. And the UK, in fact all western governments other than Norway, US, Canada and Mexico have no influence and cannot realistically make a meaningful contributions to stopping climate change. And even those countries that can contribute will have to give up A LOT and it won't matter unless you get China, Russia and Saudi Arabia to follow suit.
Oh and if you do get this going, it'll cause a lot of pain in most of the world.