Determine the Author's Tone

In her recent article discussing the effects of climate change on polar bear populations, Dr. Emily Hart asserts that the rapid melting of Arctic ice is a dire warning sign for both the environment and wildlife. She vividly describes the struggle of polar bears as they swim longer distances to find food, highlighting the troubling reality that they are losing their natural habitat at an alarming rate. Dr. Hart concludes by calling for immediate action to address climate change, emphasizing that the time for discussion is over and that bold, effective measures must be implemented.