The G-8 summit in Scotland has ended with agreements to increase aid to Africa and to help the Palestinian Authority, and with a pledge to address global climate change. Closing the summit on Friday, British Prime Minister Tony Blair said the G-8 leaders agreed to increase development aid to Africa by 25-billion dollars a year by 2010, more than doubling the aid, compared to 2004. He said they also finalized an agreement to forgive the debts of 18 of the world's poorest countries, 14 of them in Africa. The eight leaders (of the United States, Britain, France, Germany, Italy, Japan, Canada and Russia) also pledged to tackle global climate change and promote the development of clean and renewable energy. Mr. Blair said the leaders agreed that global economic growth is key to reducing poverty. He said the group reaffirmed its commitment to open markets and reduce farm subsidies, and would discuss them at trade talks in Hong Kong in December.