Scientists in California have set up a unique experiment to track the life histories of some of the world's oldest and tallest trees.
The project is designed to follow up research, in the Yosemite National Park, which suggests that giant trees are perishing as a result of climate change.
An analysis of data collected over 60 years has led scientists from the University of Washington and the Yosemite Field Station of the US Geological Survey, to conclude that the density of large diameter trees fell by 24% between the 1930s and 1990s.
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"We want to identify the reasons for tree mortality and if those are changing," says Dr James Lutz, a research associate at the university's College of Forest Resources.
