Scope 1 emissions

Scope 1 covers the direct greenhouse-gas emissions from sources the organisation owns or controls — the stationary combustion in the boiler and the furnace, the mobile combustion in the company fleet, the process emissions from the chemistry of making the product (cement calcination, steelmaking reduction, ammonia synthesis), and the fugitive emissions from the refrigerant leak and the methane that escapes the pipeline and the valve. Scope 1 is the most controllable category because the source is on the site the operator runs, and it is the starting point of every decarbonisation roadmap — the emissions the company can cut without a supplier or a customer having to move first. The GHG Protocol is the accounting standard, and the EPA Greenhouse Gas Reporting Program under 40 CFR Part 98 is the US mandatory report for the facilities above the 25,000-tonne threshold.

The discipline that makes Scope 1 useful is the inventory boundary — the organisational and the operational boundary that decides which sources count, drawn the same way every year so the number is comparable across years and across sites. The two failures are the boundary that quietly shrinks to make the target and the fugitive emissions that go uncounted because no one measured the refrigerant top-up, and a Scope 1 number that omits the fugitives is the number that looks good until the methane plume shows up on a satellite. The reduction levers are the fuel switch, the efficiency, the electrification of the fleet, and the leak detection on the refrigerants, and the metric that tracks them is the absolute tonnage and the intensity against the unit of product. See GHG Protocol, Scope 2, and ESG.