Top 10 biggest man-made changes to the natural world

People have left their physical mark on the planet, sometimes by accident but mostly on purpose. However destructive that purpose might have been, it's often come at a cost to millions.

From the Three Gorges Dam in China which displaced 1.3 million people to the little-known Betsiboka Estuary in Madagascar, which saw the removal of an ancient forest resulting in soil erosion and hardship for locals.

But one that may surprise you is the Scottish highlands, which was once covered in lush ancient forests. The more barren but beautiful landscape we see today is largely the result of farming for 3,000 years rather than the result of nature.

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