Another approach: ask the kids what they know:
Sunni Tang from the Alliance for Climate Education tells me “It's never too early to have the talk about climate change. Climate change isn't just a science issue, it's a human justice issue and the fight for climate justice is a fight for values such as equity, justice, and sustainable living.”
Children's author Megan Herbert offers some excellent suggestions about talking to kids about climate in this article. Her suggestion to take the time to find out from the children what they already know makes a lot of sense. She suggests you can talk about climate with even very young children but you need to keep the conversation solutions focused and perhaps focused on protecting aspects of nature they care about from climate impacts.