This is a very interesting question well it depends on the age group or level of education that your catering to. Secondly, your objectives and goals in terms of education do you want them to understand certain concepts. 

Lastly, climate change is very broad therefore is quite tricky to create a manual but you can create certain guidelines for yourself that can help you attain your goal.

Pictorial reflect  of greenhouse effect.

Cause of climate change,

Mitigation method .

And mass awareness of man's contribution to it how to reduce it

Thank you for your responses. They're really thoughtful. 

Dear faith, 

I would like us to look at the climate change manual for children in the context of Early child development, child psychology and the teachers perspective.  The project Climate Education for school children in Makurdi will hold Focus Group Discussions with key actors to agree on 

1: What can work?

2: Who can work on such documents?

3: The work plan and the communique

4: The frame work for dissemination of Climate Education and so on.

This implies that its not going to be a one way or thought and every actor/ driver is carried along.

How ever the team will also appreciate your input when due. 

Thanks 

JIMENGI ASAN