Conservationists urge action as the headwaters of the River Thames vanish

Across Europe, rivers have sunk to historic lows because of brutal heat waves fueled by climate change. In Britain, conservationists are urging the government and water companies to take action to counter devastating droughts. Meanwhile, the source of the legendary River Thames has dried up and moved several miles downstream, further than it's ever gone before. Malcolm Brabant reports.
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