def fill_paragraphs(text, width=None, preserve_newlines=False):
    """
    Wraps multiple paragraphs in text and returns them.

    :param text: paragraphs to be wrapped
    :param width: ensure that each paragraph is at most width chars long
    :param preserve_newlines: preserve newlines in text if True
    :returns: a text with wrapped paragraphs
    """
    if width is None:
        # if width isn't passed then try to get value from the operating
        # system environment or fall to default.  please note, the try
        # block is used because we don't want to fail in case of garbage
        # in the environment variable.
        try:
            width = int(os.environ['COLUMNS'])
        except (KeyError, ValueError):
            width = 70

    if not preserve_newlines:
        return textwrap.fill(text, width)

    return '\n'.join(textwrap.fill(line, width) for line in text.split('\n'))