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In page Climate restoration:

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The endpoint goal of climate restoration is to generally maximize the probability of survival of our species and civilization by restoring Atmospheric CO2 levels. The approximate target levels are those of the Holocene norm in which our species and civilization most recently evolved. That is stated technically as "pre-industrial", or poetically as "like our grandparents had a hundred years ago". Numerically the goal is stated as getting atmospheric CO2 back below the highest levels humans have actually survived long-term, 300 ppm, by 2050.[citation needed] Achieving this will require permanently removing approximately a trillion tonnes of atmospheric CO2.