We usually do conferences in cryptography/security, and most of them have page limits: CCS, USENIX, NDSS, S&P, CRYPTO, EUROCRYPT all have page limits (some allow appendices, which reviewers are not obligated to read).
Yes, if you count the emissions for the stuff manufactured in China for (not only) european customers.
If you look at consumption-based emissions[0], China is at 7 t per capita, which is 8 t less than the US, 2 t less than Germany and about par with Denmark, Slovakia, and England.