Indian Prime Minister Manmohan Singh (C) shakes hands with Cairn Energy chairman Bill Gammell (2nd R) as Chief Minister of the western Indian state of Rajasthan Ashok Gehlot (L) and Cairn India chief executive officer Rahul Dhir (R) looks on during the inauguration of the Mangala oil field in Barmer on August 29, 2009. Prime Minister Manmohan Singh on August 29 invited global investors to put their money in India as Britain �s Cairn Energy began pumping crude from a vast oil field in the desert state of Rajasthan. Singh told a ceremony inaugurating the country's largest inland oil field that Cairn's success in developing production showed the world that 'India has a good climate for foreign investment.'