The following sections provide further details.Trinidad and Tobago s Mitigation Contribution Mitigation Objectives Unconditional: 30% reduction in GHG emissions by December 31, 2030 in the public transportation sector compared to a business as usual (BAU) scenario (reference year 2013).1 Conditional: Additional reduction achievable under certain conditions which would bring the total GHG reduction to 15% below BAU emission levels by December 31, 2030. Financial Requirements: The estimated cost of achieving the reduction objectives is USD 2 billion, which is expected to be met partly through domestic funding and conditional on international climate financing including through the Green Climate Fund. Methodological Approaches: The BAU baseline was developed using an ad hoc model based on the BIOS tool, rather than the wholesale application of prefabricated models.