A planned 665 mile (1,070 km) pipeline from southern Chad to Cameroon's Atlantic coast promises riches for both countries - especially for dirt-poor and landlocked Chad whose economy could be transformed by around $2 billion in royalties over 25 years. But the scheme has drawn criticism from human rights and lobby groups worried about environmental damage and that revenues will not benefit ordinary people. Some campaigners have urged a halt until a firmer regulatory framework can be created.