"Polar bears did very well in the warmer times. They didn't die out at all; they didn't die out in the last 10,000 years, nor during the previous interglacial, nor the one before that. So, they're just used as a deceitful heartthrob; you know, to pluck your heartstrings because the polar bears might die out"

This quote by Piers Corbyn is describing the false narrative that polar bears are in danger of termination due to climate change. Corbyn is arguing that polar bears have actually been around for countless years and have actually been able to survive through multiple interglacials, so they are not in threat of dying out. He thinks that the narrative of polar bears being in risk is being used to control people's emotions and to make them more likely to take action on climate modification. He thinks that this narrative is deceitful and is not based upon facts. He is suggesting that the narrative of polar bears being in threat is being utilized to yank at individuals's heartstrings and to make them more likely to do something about it on climate modification.