Investec Thames Challenge
The Investec Thames Challenge Swim was a swim down the River Thames by Lewis Pugh in 2006. Pugh became the first person to swim the entire length of the River Thames to raise awareness about the severe drought in England and the dangers of global warming.
The 350 km (217.5 miles) swim took him 21 days to complete. The river had stopped flowing due to the drought, forcing Pugh to run the first 40 km of the river. While swimming through London, Pugh exited the water and made a visit to Tony Blair at 10 Downing Street to call on the United Kingdom to move towards a low carbon economy. Shortly afterwards the Prime Minister introduced the Climate Change Bill to Parliament.