. >> we are back with marcia argust, product director for restore america's parks. thank you for being with us. >> guest: thanks for having me. >> host: tell me what restore america's parks is and what is your interest in the subject? >> guest: the restore america's parks campaign started three years ago at you and we are focused on protecting national parks. resources, cultural resources, natural resources by addressing the deferred maintenance backlog that iscu affecting th national park system. this $12 billion worth of repairs that need to be done nationwide.s >> host: how does that backlog come into being? have parks been underfunded the entire time or is this something that has happened in the past few years suddenly? >> guest: it started happening over a number of years, the past decade even more. the national park service is over 100 years old and the stability and infrastructure of our parts are deteriorating. a lot of structure has reached the end of its lifespan. add to that 300 million visitors come to our parks each year and there is not enough p fundin