So I am coding in R (using ggplot2) and I am trying to change my bar graph so when the mean(epa) is below 0 the bar will be red and when it's above 0, it will be green. I know my indexing is messed up and I'll mess with that another time but this gives me the output I want aside from the bar colors. A link to resources to help would be okay if you can't write the code given what I have posted here.

russ2020 russ_graph