a. ECS = 1.65 to 3.2 C b. Emissions rates, e.g. RCP4.5, 6, 8.5 c. Damage function =??? (This is the most critical
of all, but I don't understand the input
parameters or how how to vary them to
give justifiable range
of impacts) d. Appropriate discount rates, e.g. = 3 %, 5 %, 7 %, 10 % (i.e., up to what has been widely used by aid agencies for investment decisions for infrastructure
projects over the past half century or so — e.g. 10 % and 12 % by World Bank for energy
projects).
Besides,
given the plainness
of the specification and the fact that it was estimated on 55 observations, I think managing to
project with 95 % confidence where the temperature levels are going to be at 73 years later, and succeed, is pretty good for a 4
parameter model.
«For the savvy buyer
of construction services,» Brown says, «there is no substitute for hiring somebody who will be your partner in helping you see where your money is being spent,
give you accurate information, and then take the burden
of construction off your hands by producing a
project in a timely manner and within budget
parameters.»