Enterprise Rent-A-Car - the largest rental car company in North America - marked a significant milestone in February 2007: its 50th anniversary. To commemorate this achievement, thank the customers and communities that made this success possible, and look forward to the next 50 years, Enterprise made an unprecedented gift to The National Arbor Day Foundation. Enterprise has formed a partnership with the Foundation to plant 50 million trees over the next 50 years - a gift, in total, of more than $50 million dollars.