“EARTHDAY.ORG™ believes every learner in every school in the world should receive fully integrated, assessed climate and environmental education with a strong civic engagement component.” https://www.earthday.org/earth-day-schools/
Earthday.org has developed many educational resources covering a range of different aspects of protecting the Earth, all those developed for previous years are still available and may be more beneficial for your school than those developed for this year. For example, the 2017 resources cover environmental literacy, 2018 – Plastic pollution, and 2019 – Protect our species, etc.
There is a downloadable pdf, Earth Day for primary schools sharing lots of ideas on how the event can be celebrated in schools. There is also a pdf for use at home. Both documents contain links to resources available for support. To sign up for Earth Day visit the site.
Other useful resources for Earth Day 2023 are listed on their site, for example:
Climate Restoration for Kids is a digital lesson about climate change and restoration for children to work through alone.
“Captain Planet Foundation offers resources to engage and empower young environmental problem solvers right in your backyard, including Project Hero and lessons from Project Learning Garden. See this page for a curated collection of resources.”
Teachwire also offers a whole Key Stage 2 Scheme of Work based on Climate Change. This may be a useful resource for Earth Day 2023.