This paper analyses “fair and adequate” emission reduction ranges for 2025, 2030 and 2050 for Brazil, India and South Africa, largest economies and a set of African countries (part of MAPS – Mitigation Action Plans and Scenarios Programme). This analysis provides insight into the key differences between a wide range of effort sharing models, criteria, their proxy metrics and the most important assumptions that influence countries’ emissions allowances under different equity regimes. This analysis provides insight into the key differences between a wide range of effort sharing models, criteria, their proxy metrics and the most important assumptions that influence countries’ emissions allowances under different equity regimes.