“The Sierra Club is a 128-year-old organization with a complex history, some of which has caused significant and immeasurable harm. As defenders of Black life pull down Confederate monuments across the country, we must also take this moment to reexamine our past and our substantial role in perpetuating white supremacy.”
I think this is a pretty solid statement that treats the issue fairly. I like a lot of organisations with a lot of historical baggage would do well to read it.