Radiative forcing is measured in watts per square meter. If you compute the total surface area of the earth [0] in square meters and that by multiply the radiative forcing number, you get watts.
[0] technically some layer of the earth between the ground and whatever you define as the edge of the atmosphere.
Next time you might just apologize for incorrectly using the word "energy" when you meant flux, and for being off by an order of magnitude... The defensive stance is not a good look.