CHANGE AGENTS 12. “Sustain Our Africa” Speaker Stefan Raubenheimer talks about: Quantifying and allocating the Earth’s resources in order to cross the climate change gulf. Stefan works with governments in Latin America and around the globe, assisting them to quantify and allocate their share of the earth’s resources in order to assist a global move towards closing the divide between what we claim from the environment and what would be a sustainable amount to take.