Coldplay sing fair trade plea

British rock band Coldplay sang its support for fair trade to a sellout crowd in Mexico City just days before the start of a meeting of the World Trade Organisation in Cancun.

The band broadcast on a giant video screen the message Make Trade Fair, the name of a campaign by the British charity Oxfam, during a two-hour concert at the Palacio de los Deportes stadium before a crowd of about 25,000.

The campaign asks Governments to reduce subsidies to farmers in rich countries and eliminate the dumping of agricultural products on vulnerable markets.

In support of the cause, Coldplay plans to deliver Oxfam's Big Noise petition containing more than three million signatures to the WTO meeting in the Caribbean resort.

"Make sure you check out the Make Trade Fair website," said Coldplay vocalist and front man Chris Martin, donning a Mexico national soccer team jersey.