Donate
There are many different places that are trying to help solve this ever-present problem. Find any of these places that you are passionate about and give money or time. Every penny helps! These are my suggestions:
Pick it up
When you are around a beach or ocean and you see trash and plastic make sure to pick it up. Do not just walk past but make sure to pick it up and if it is plastic recycle it. If it is something else make sure that it gets to place where it will be deposited in a way that would not hurt our oceans and world.
Recycle
I talked about it a little but make sure that you recycle. Recycling eliminates the whole problem of plastic ending up in our oceans. When we recycle it skips the whole step of plastic going to landfills and then ending up in our oceans. Recycling reuses already used plastic and makes it into something else.