There's a dark side to "Cash for Clunkers."

The popular program is being blamed for hurting charities that rely on donations of cars to fund social programs.

Those charities say their donations have fallen up to 12-percent already since "Cash for Clunkers" was implemented.

They fear that as time goes on, their annual donations will drop 25-percent, which amounts to more than 100-million dollars.

The "Cash for Clunkers" program gives car buyers up to 45-hundred dollars for trading in their gas guzzlers for more efficient models.