Brad Steiner from The Perspectivity Foundation discussed addressing sustainability through dialogue. He defined sustainable development as meeting present needs without compromising future generations' ability to meet their own needs. Steiner explained the four conditions for sustainable development: not increasing substances extracted from or produced by the Earth and not degrading the planet physically or undermining people's ability to meet needs. He described complex social problems and the need for dialogue to create understanding between different perspectives to solve such problems sustainably. The Perspectivity Foundation aims to enhance dialogue through games and share knowledge to address complex issues.