The first years in life are a very critical period, with young brains developing rapidly in all ways: socially, cognitively, and emotionally. It is also during this stage that children develop their attitudes, values, and beliefs about the world around them, which can shape their behaviors and habits for life. Early childhood is where we have to begin to grow the sustainability mindset. Talking to children about practices and policies that promote the environmental, social, and economic sustainability seems quite involved but we have reached the stage where there is no time to waste because there is no “planet B.”