In 2007, "Environmental Education Research" dedicated a special issue to childhood and environmental education. This paper makes a case for "early childhood" to also be in the discussions. Here, I am referring to early childhood as the before-school years, focusing on educational settings such as childcare centres and kindergartens. This sector is one of the research "holes" that Reid and Scott ask the environmental education community to have the "courage to discuss". This paper draws on a survey of Australian and international research journals in environmental education and early childhood education seeking studies at their intersection. Few were found. Some studies explored young children's relationships with nature (education "in" the environment). A smaller number discussed young children's understandings of environmental topics (education "about" the environment). Hardly any centred on young children as agents of change (education "for" the environment). At a time when there is a growing literature showing that early investments in human capital offer substantial returns to individuals and communities and have a far-reaching effect--and when early childhood educators are beginning to engage with sustainability--it is vital that our field responds. This paper calls for urgent action--especially for research--to address the gap. (Contains 1 note and 1 table.)