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The answer for Question #1 should be far in the future past the year 2100, the end of this century.
The answer for Question #1 should be far in the future past the year 2100, the end of this century. Let's stick with the scenario described in Question 1 and assume that after 2066 humans start removing carbon from the atmosphere on a massive scale using technology. Such technology is currently called carbon sequestration and storage (CSS).
At what rate, in gigatonnes per year, will humans need to remove atmospheric carbon via CSS to ensure that the atmospheric concentration of carbon dioxide returns to 350 ppm by 2100?
If modern CSS techniques cost ~$40 billion per gigatonne of carbon, how much will we spend each year to remove this excess carbon?
Hint:
1) Use the steps described in Question 1 to calculate how much excess carbon remains in the atmosphere by the end of 2066.
