Prime Minister Manmohan Singh and his wife Gursharan Kaur are received at the Frankfurt International Airport yesterday. The prime minister had a stopover in Frankfurt on his way to Mexico and Brazil to attend the G20 Summit and the Rio+20 meeting, respectively. The Rio summit, commencing on June 20, is being held 20 years after the first Earth Summit, a landmark gathering, in a renewed bid to rally the world behind a common environmental blueprint.