[eecc]

Gg, Tg? Is that Giga-gram and Tera-gram? Why not kg, the SI standard unit for mass?

[heyoni]

I think it is an SI unit: https://en.wikipedia.org/wiki/Orders_of_magnitude_(mass)

[wcoenen]

"Teragram" appeared in the original IPCC reports circa 1990, so this has been a thing for at least a gigasecond.

[Turskarama]

Adding an SI prefix to an SI unit is standard practice rather than adding a bunch of trailing zeros.

[schiffern]

> Is that Giga-gram and Tera-gram?

Should be "gigagram" and "teragram," with no capitalization and no hyphen. See section 5.3 ("Unit Names") of the official SI Brochure.[0]

[0] https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-...