Checks for environment variables that can cause problems with supernova

def check_environment_presets():
    """
    Checks for environment variables that can cause problems with supernova
    """
    presets = [x for x in os.environ.copy().keys() if x.startswith('NOVA_') or
               x.startswith('OS_')]
    if len(presets) < 1:
        return True
    else:
        click.echo("_" * 80)
        click.echo("*WARNING* Found existing environment variables that may "
                   "cause conflicts:")
        for preset in presets:
            click.echo("  - %s" % preset)
        click.echo("_" * 80)
        return False