No countries are doing well in preparing for a sustainable future at present as this website shows. It lists the countries in rank order of how well they are doing and includes a world map to show their locations.
Poland is 122nd and the UK 131st on the list of 163 countries included on the list. Top of the list are: Cuba; Costa Rica; Sri Lanka; Albania and Panama.
The Sustainable Development Index (SDI) measures the ecological efficiency of human development, recognizing that development must be achieved within planetary boundaries. It was created to update the Human Development Index (HDI) for the ecological realities of the Anthropocene.
The SDI starts with each nation’s human development score (life expectancy, education and income) and divides it by their ecological overshoot: the extent to which consumption-based CO2 emissions and material footprint exceed per-capita shares of planetary boundaries. Countries that achieve relatively high human development while remaining within or near planetary boundaries rise to the top.