I don’t know about writing 150 words but if I was an activist talking at a school assembly, this is how I’ll introduce myself. Good morning students, welcome to the school assembly. I am an activist and I will be talking to you about ways to protect the environment. Ways we can protect our environment is stop throwing garbage on the floor to ruin our oceans. We are ruining our earth & environment day by day and we have to stop it before it’ll be too late for the earth, etc. hope this helps
