So the big news of the day is that 2018's global CO2 emissions are projected to be 2.7% above 2017's number.
That is, indeed, not good news. It's a fairly big number. It will deflate a lot of hopes.
FRED says only that, strangely, 2015 World GDP was -5.6% lower than 2014's. I've seen this before and it mystified me then, too.
So I can't compare 2017's World GDP to 2016's.
WaPo plays coy with their source material, but it's this paper in Earth System Science Data. (Which is at least open access.)
Why the increase? Part of it is the increase in US CO2 emissions that I wrote about earlier, running about 1%. Part of it is about China's increased emissions. And then India's too. These Big-3 cover most of what's going on.... After a quick read, I don't see where they give the recent annual increases by country, but I might change my mind after a 2nd reading with fresh eyes.... I hope I'm wrong about this, but if not they've been irresponsible.
The problem is that from 2013-2015 global CO2 emissions seemed to be flat. People misattributed this (apparently) to a permanent decrease in global burning of fossil fuels, but that was clearly not true when the year-over-year increases in 2017 were 1.6% over 2016's value.
Then the yellow jackets in France are protesting higher fuel prices due to carbon taxes. I think a carbon tax-and-dividend would handle this nicely, and even alleviate poverty, but no politicians have enough foresight and bravery to offer one. So it's no surprise they are going to get pounded on such taxes.
How can these emissions be calculated so exactly? Because oil, natural gas and coal cost money!, and these billings from large companies are relatively easy to add up. And because carbon people have a pretty good idea of how land use changes -- like turning a forest into a field, or building in a city -- count towards carbon emissions. I'm sure it's not easy work, but it's not especially complicated, either.