By downloading logo files from this website, you agree to follow the style guide. Make sure to read it completely before using the Sierra Club logo. If you remember one thing about the Sierra Club logo, it's that the black and white logos are not interchangeable, you must use a different file for each usage.
Always select the correct logo for your usage and don't change the color(s). The tree in the logo should always be dark. "If the tree is white, that's not right."
If you want to use the Sierra Club logo on a dark background, select the white logo. Do not open the black logo file and change it to white. All the logo files you need can be found here: Download Files
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Remember: "if the tree is white, that's not right."
Our full style guide can be found here: Style Guide.