NO_COLOR 1 is an env var that some tools (even Cargo!) have standardized around to prevent the printing of color control characters.
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/// Determine whether we should emit colored output. True if
/// we started the pager (so we know it can read color codes)
/// or stdout is a tty, otherwise false.
/// Determine whether we should emit colored output. True if either we
/// started the pager (so we know it can read color codes) or stdout
/// is a TTY, and the environment variable [`NO_COLOR`] is unset;
/// otherwise, false.
///
/// [`NO_COLOR`]: http://no-color.org/