Exhibit 3: Emissions Intensity by Steelmaking Archetype

Additional methane impact (GWP-20 year)*
Methane leakage (GWP-100 year)*
Additional supply chain (mining, beneficiating, pelletizing, oxygen)
Electricity use
Gary Works CCUS Project Impact
Direct on-site emissions
“Near Zero” Progress Level 4 at 20% scrap share of metallic inputs**

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Average intensities per archetype, 20% scrap level assumed.
Scope 2 grid factor = 0.46t CO2/ MWh; Upstream grid factor = 0.26t CO2 / MWh (MISO North); H2 is modeled to be 100% RE, behind-the-meter production
2.2% NG methane leakage rate, coal methane leakage derived from thermal/met-specific averages from operating US coal mines
The abated BF-BOF assumes a 33% reduction in direct emissions from the use of CCUS and hydrogen injection; Methane leakage from the abated BF-BOF represents net impact across H2 substitution and CCUS interventions.
H2 DRI EAF pathway assumes pyrolysis oil in the pellet plant and H2 use for ore heating in the DRI.
Ore-to-pellet feed rate to produce DR-grade pellet assumes crude ore with in-situ grade of 31.66%Fe (Cleveland Cliff’s United Taconite mine); BF-grade pellet assumes crude ore with in-situ-grade of 24.88%Fe (avg of all US mines).
*Global Warming Potential measures the relative warming impact of one unit mass of a greenhouse gas relative to carbon dioxide, over a specific time horizon (20 years or 100 years).
**Responsible Steel International Production Standard V 2.1
***Dedicated RE is used for only on-site electricity use and does not apply to upstream power consumption.