Titans of the Ice Age premieres March 21

David Clark makes big movies: Imax stuff projected on screens the size of a building. His newest 'Titans of the Ice Age” recreates the time of the woolly mammoth. And it premieres March 21st at the Smithsonian's giant Natural History Imax theater as one of the showpieces of the environmental film festival.

Clark has produced and directed for more than 40 years. He came to Washington to work with the Smithsonian and National Geographic. His films have taken him all over the world, thanks to ideas formed in this tiny home office in Chevy Chase.

This weekend, “Oz the Great and Powerful” dominated the box office, making $80 million and affirming the power of the PG rated family film.

For more information on the Environmental Film Festival, click here.