Environmental and human rights groups launched a campaign against a BP-led trans-Caspian oil pipeline...BP holds a 33 percent stake in the venture, Unocal has 8.9 percent, Norway's Statoil 8.7 percent and the Azeri state oil company SOCAR 25 percent. The remainder is owned by Turkish, French, Japanese and Saudi firms...the campaigners say the pipeline will further damage the Caspian's delicate ecology and that the impoverished populations of the three participating countries will not benefit from the oil revenues because of corruption. BP denies the allegations