â 35% reduction relative to the business-as-usual emissions in 2025 conditional upon international support. â 35% reduction relative to business-as-usual emissions in 2030 without international support (unconditional). â 70% reduction relative to business-as-usual emissions in 2030 conditional upon international support. e. Information on sources of data used in quantifying the reference point(s) For the preparation of Barbadosâ 2021 NDC update, the 2013 Greenhouse Gas Inventory (GHGI) was significantly updated, improving historical activity data and methodologies especially in the energy and waste sectors. This update improved the completeness and accuracy of the estimates that are the base of Barbadosâ ambition.