Existing infrastructure will also be retrofitted, or managed differently, because of climate change.Updated Nationally Determined Contribution 5. MITIGATION CONTRIBUTION In order to contribute to the mitigation of global GHG emissions, Sierra Leoneâs commitment is to reduce its domestic GHG emissions of 10% by 2030 as compared to a no-policy scenario of 2015 to 2030, with an intermediary indicative mitigation target of 5% reduction by 2025 against the same baseline. In the longer term, Sierra Leoneâs mitigation ambition is to cut GHG emission by 25% in 2050 with the inclusion of additional sectors and gases in the successive NDCs with clear and measurable mitigation targets and specific actions.