This year I donated monthly
1. Through GiEffektivt to their top recommended charities
2. to Nähtamatud Loomad

I also "donated" about 300-400 hours of my time to EA community building.

I think it is crucial to point out that while there may be little  direct effect of plastic pollution on morality of animals, plastic (mainly microplastic) is a vessel for pollutants and can therefore transport in chemicals, which can cause death in the organism. Therefore the effect of plastic is indirect, while clearly still playing a very crucial role.