Dear Grandpa,

            Yesterday was Earth Day and I learn how to save the earth at school. I never knew that plastic didn’t decay for so many years. I use PET bottles and paper cups every day, and now I realizeI have been making so much waste every day. I also learn how to recycle, so I made this pretty postcard with a tissue box to write this message to you.

            Christmas is coming soon, I can’t wait to visit you. See you soon.

            Best wishes,

            Helena.

What did Helena learn yesterday?