Again, the level and expense of the atmospheric carbon drawdown required to avert catastrophe and restore planetary energy balance will depend, in part, on present and future emissions, so that relevant decisions remain in significant part within the control of the targets of your present investigation. Relevant to those necessary decisions then, as indicated in Exh. B at 13-15, if emissions reductions of 6%, on an exponential basis, commence (at long last) in the year 2021, then the requirement to extract atmospheric carbon in order to avert catastrophic climate change will be ~153 PgC. If, however, emissions do not steeply decline but, instead, remain at their present level, then the carbon extraction required grows to ~695 PgC. And if emissions grow at a rate of 2% per year (“modestly slower than the 2.6 %yr-1 growth of 2000–2015” – see Exh. B at 12) then ~1630 PgC extraction will be needed to reach the level of <350ppm atmospheric CO2 by 2100. In terms of necessary expense, as denoted above we analyzed only the range of cost estimates for extraction requirements above the ~ 100 PgC that we estimated could be stored through improved forestry and agricultural practices. Id. at 15. Accordingly, if global emissions reductions of 6% commence in 2021, then an additional ~53 PgC by way of “technological extraction” would be required in order to return atmospheric CO2 concentration to < 350 ppm, and thus potentially avert catastrophic warming. Our estimated cost for this level of extraction of this is $8-18 trillion, or $100-230 billion per year if spread evenly over 80 years. available at http://www.precisrcm.com/DFID_Philippines_Reporting/Philippines_Sea_Level_Report _Oct_2016.pdf, and Rietbroeka et at., Revisiting the contemporary sea-level budget on global and regional scales, Proceedings of the National Academy of Sciences (Feb. 9, 2016) available at www.pnas.org/cgi/doi/10.1073/pnas.1519132113 Page 5 of 7