The United Parcel Service began using biodiesel blends at its most vital hub in Louisville, Kentucky this month. (Logo: <a href="http://photos.prnewswire.com/prnh/20100830/DC56543LOGO-b)">http://photos.prnewswire.com/prnh/20100830/DC56543LOGO-b)</a> There is a finite amount of petroleum-based fuel available from our planet so it is important that UPS and other companies invest in ways to use alternative fuels and technologies, including biodiesel, said Scott Wicker,