When Barack Obama was a senator, he proposed a Global Poverty Act to fulfill the U.N.’s Millennium Development Goals. The cost in additional foreign aid: $845 billion. On Thursday, as part of the G20 summit, Bill Gates, co-chair of the Bill & Melinda Gates Foundation, delivered a report on “financing for development” that proposes global taxes on America and other “rich” nations to make the Global Poverty Act a reality.