What does it take to transform an idea from one that serves hundreds to millions, if not billions? Sanjay Purohit has spent his career aiming to crack this code. As the CEO and Chief Curator of Centre for Exponential Change, Purohit knows firsthand that scaling social impact requires more than just good intentions—it demands a complete reimagining of how we approach societal change. Since 2016, he's been pioneering "Societal Thinking," an approach that's reached over 500 change leaders across 20 countries, tackling everything from climate action to gender equity. Think scale: A curation of ideas to help you—the first in his groundbreaking trilogy on social transformation—captures these battle-tested insights.