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You said 400Gt, not 4 Gt, in Post 14. 400 Gt = 4e11 tonnes = 4e14 kg.
Ah, there's Lucy and the American football again... The phrasing of your question suggests a demand to produce a deterministic prediction. "In Year X, this point on the globe will be Y degrees warmer on average than it is today." Surely you know that different models about future climates make different predictions, right? And that experts are up-front about the variation in these predictions, right?
There's another issue that doesn't get raised enough. The costs of inaction. Is that something humanity really needs to take a chance on?
1, Ah yes, 400 x 10^12 (Giga) x 10^3 (Tonnes to Kg) x 10^3 (Kg to g) x 4.2 x 4. So 67.2 x 10^20. Both took a second try at it.
2, No I don't want you tell me about the warming but the bad thing. Select a place and tell me what bad thing will happen.