You can write about plants and how they help us as in herbs and how they don’t as in drugs (if it’s appropriate) and how they grow for example if a plant doesn’t get sun it will physically grow in a position to get sunlight
You can also write about the past like when slavery happen you can specifically write about Harriet Tubman and how many slaves she freed and how she risked her life for them or Fredrick Douglas and how he stop slavery by speaking out to the public and how he was a free man
That’s all I got for you now but if you find something then else good luck