(video) Measuring Redwood Giants — “We have 175 Redwoods now in the world that are over 350 feet tall” • Steve Sillett’s team measures every branch of many

Forest ecologist Steve Sillett is leading a team of scientists as they climb and measure every branch of some of the last and tallest old growth redwoods in California. Their goal is to learn how these ancient giants have historically responded to climatic shifts and to monitor how they are being impacted today by global warming.