French climber Alain Robert, also known as 'Spiderman', is arrested by police after climbing the Lloyds Building in a protest to raise awareness of climate change, in central London April 2, 2009. World leaders are set to declare an end to unfettered capitalism at a G20 summit on Thursday after France and Germany demanded they act fast on promises to prevent a repeat of the worst economic crisis since the 1930s. [Agencies]