; and (2) any changes to net greenhouse gas emissions that would— (A) indirectly result from activities required to carry out the bill or resolution; and (B) not otherwise have occurred. (d) Established best practices In calculating the carbon score under subsection (a), the Director shall, to the maximum extent practicable, use established best practices for estimating emissions, such as— (1) lifecycle analysis; and (2) internationally recognized methodologies (such as guidelines from the International Panel on Climate Change). (e) Timeline The Director shall calculate the carbon score under subsection (a) on the same timeline as the Director carries out the analysis under section 402 of the Congressional Budget Act of 1974 ( 2 U.S.C. 653 ). 4. Authorization of appropriations There are authorized to be appropriated to the Director such sums as are necessary to develop the expertise and capacity required to carry out the analyses required under section 3.