UNITY — CIFF Selects and Unity College will present a free screening of the award-winning documentary film, “Chasing Ice” at 6 p.m. Thursday at the Unity College Center for Performing Arts, 42 Depot St. The screening is co-sponsored by the Sheepscot Wellspring Land Alliance.

In the spring of 2005, acclaimed environmental photographer James Balog headed to the Arctic on a tricky assignment for National Geographic: to capture images to help tell the story of Earth’s changing climate. Even with a scientific upbringing, Balog had been a skeptic about climate change. But that first trip north opened his eyes to the biggest story in human history and sparked a challenge within him that would put his career and his very well-being at risk.

“Chasing Ice” is the story of one man’s mission to change the tide of history by gathering undeniable evidence of the changing planet. Within months of that first trip to Iceland, the photographer conceived the boldest expedition of his life: the Extreme Ice Survey. With a band of young adventurers in tow, Balog began deploying revolutionary time-lapse cameras across the brutal Arctic to capture a multi-year record of the world’s changing glaciers. For more information, visit uccpa.unity.edu, or call 207-948-7469.