One of my favorite books of the Bible is Habakkuk, because it looks right at that problem and demands that God give an answer for evil. The writer lays it out - if God is in charge, why is evil so prevalent? But God says back, I'm coming soon to punish Israel, Habakkuk's people, for the evil they do - Babylon will come and ravage them.
Habakkuk is, to put it lightly, concerned with this plan. Isn't that just replacing one evil with a greater evil? But God responds again, saying that the day will come when Babylon too will be punished for their own evil. In the end, God is using them and will swap the plot around on them. As Martin Luther King said, the arc of the universe is long, but it bends towards justice.
Evil is still around now, but I believe that God is powerful enough to bring even the things done against Him to proclaim His glory. And one day, God and His people will win for good. And in the meantime, I have touched God, I've felt Him working in me, speaking to me and pushing me in certain ways. Go and shout to Him, and I have no doubt that He will answer in one way or another. You just have to be able to perceive when that is. The Orthodox tradition has the Jesus prayer - "Lord Jesus, have mercy upon me, a sinner." I'm not Orthodox, but I've enjoyed meditating on every word, emphasizing them, drawing out all the meanings of each one and how I relate to it.
Right now, seek out the people who actively resist evil. You talked about environmental causes - find ones important to your area, and find groups who are trying to make them better. The best ways to change something is to start smaller, and work outwards. Volunteer or work for them, and see what is being done where you are. Don't get discouraged if it takes a while to see results or have breakthroughs; this is politics, and its wheels grind excruciatingly slowly. I work for a company that does environmental work, and after all that has gone through the process of deciding that Something has to be done, it can still be a struggle to get things going. You want to be an artist, so make works that show your own experience with racism, its foolishness, demonstrating the problem and what you think needs to be done in your experience.
You have an uphill battle, I know. I'm praying for you, that you can find others who want to fight the fights you want to be a part of, and that they are successful. Evil hasn't won yet, evil will lose in the end, and I believe that you are called to resist it in your own way.