Energy giant BP says it has made its largest oil and gas discovery this century as it shifts its focus away from renewable energy and back to fossil fuels. The UK-based firm said on Monday that it is conducting tests at the site in deep water off Brazil's west coast.

BP has made its biggest oil and gas discovery in 25 years after drilling a successful well in a field off the coast of Brazil, in a boost to the energy group as it refocuses on fossil fuels. The Bumerangue field lies in the Santos Basin,