As the saying goes, "if you don't learn from the past you're doomed to repeat it," or words to that effect; which is why understanding what has happened to the Earth's climate in the past is critical if we are to make accurate predictions about our the effects of climate change in future. So how might clams help? Well, they are among the oldest living animals on Earth, surviving for 500 years in some cases. Georgia Mills spoke to lead researcher David Reynolds from Cardiff University... Like this podcast? Please help us by supporting the Naked Scientists