<div>Professor Philip Stier reveals how even as a young boy he was a committed environmentalist. <br>
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[Photo (C) Shutterstock]</div>

Professor Philip Stier reveals how even as a young boy he was a committed environmentalist. [Photo (C) Shutterstock]

Professor Philip Stier reveals how even as a young boy he was a committed environmentalist.&nbsp;<br>
<br>
[Photo (C) Shutterstock]

Philip Stier on cycling to school - #TruePlanet series

<p>Audio from the University of Oxford</p>

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