Here's a notebook that encourages you to help the environment. It says "Hedgehog Ecology" at the top and then "Recycle - Use public transportation" with Sonic leaning on a globe. Hopefully, it is printed on recycled paper!
https://sonicdistrict.com/merchandise/notebooks/4170-hedgehog-ecology-notebook#sigProId42684bdb96
Interestingly, (but not that surprising for Japan) there was also a Tails version of this environmentally friendly notebook. This one says "Ecology for the 90s" at the top and still encourages you to recycle and use public transportation (on the back as well) The inside of this one is identical to the Sonic one, seen above. The Sonic notebook appears to use a new or slightly modified stock art, but this one does not. It uses one of the older very 'snooty' versions of Tails where he has quite a long nose. This stock art didn't appear in Japan all that often.
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