Thanks for making me check, I was off a bit. It's actually more like 1400 TW. Must have dropped a digit when I remembered that.

https://link.springer.com/article/10.1007/s00382-023-06775-x

> the total radiative forcing (RF) by human activities of approximately 2.72 W m^−2 (Masson-Delmotte 2021)

(with the radius of the Earth of 6.4e6 meters and surface area = 4 pi r^2).