Info point 7: - BUDGET SLIDER AXIS

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For all budgets in CBAT, this right-hand side vertical axis shows ‘user-choice' 'slider-positions’ from ‘plus-40’ through ‘0’ to ‘minus-40’.

As emissions go from the 'zero' position to the highest position [+40], 50% of the extra carbon-weight [2010-2110] per increment of each budget-step is added to the concentrations level which are rising by position to +40 where it equals the CAF-100% reference path by 2110.

Overall this is an 'indicative array' where users are invited to take a position and see the results. The rate of this addition is a reasonable approximation to the rate at which the carbon-weight is added to the atmosphere in the UKCA according to the rate in the feedback concentration array ['Upper, Medium, Lower'] in the UKCA [see UKCA Toggle-Switch]. This integral of carbon-weight addition/subraction to the carbon-budget, is time-distributed to maintain as nearly as possible, the shape of the UKCA carbon budget.

The lowest position [-40], follows the same procedure but is equal to the concentrations level falling to equal the starting position in 2010 or effectivly a CAF-0% reference by 2110. In short with both the Integrated and the Segregated Feedback options, when concentrations reach: -

  1. the highest position [+40], it is equal to the concentrations level rising to equal the CAF-100% reference by 2110, and
  2. the middle position [0], it is equal to the concentrations level rising constantly to equal the CAF-50% reference by 2110, and
  3. the lowest position [-40], it is equal to the concentrations level falling to equal the starting position in 2010 or effectivly a CAF-0% reference by 2110.

The key difference between 'integrated-feedback' [as with UKMO] and 'segregated-feedback' [as laid out in CBAT ] is the deceleration-curves versus the acceleration-curves - in other words the shape of the emissions and concentrations curves generated. It is the reality of the latter - acceleration curves consequent on positive feedback - about which global-climate-policy-concern should be the greatest.

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