import type { GwpCalculatorInput, GwpCalculatorResult } from './types.js';
/**
 * Convert greenhouse gas emissions to CO2 equivalent using GWP factors
 *
 * @formula CO2eq = quantity × GWP factor
 * @reference IPCC AR6 (2021)
 * @param input - Gas type, quantity, and time horizon
 * @returns CO2 equivalent in kg and tonnes
 */
export declare function gwpCalculator(input: GwpCalculatorInput): GwpCalculatorResult;
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