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Amid Olympics chatter, concern continues to grow over extreme weather and rising food prices, with many tweeting this week about IRIN’s “Food: Price Shock Hotspots.” BBC News Magazine looks at possible future climate-friendly food stuffs —including insects, lab-grown meat, and algae—in “Future Foods: What Will We Be Eating in 20 Year’s Time?” Demand for protein is expected to expand along with the global middle class—which may be as large as 600 million people in G20 developing countries, according to a Carnegie Endowment paper, "In Search of the Global Middle Class." Authors Uri Dadush and Shimelse Ali argue their "Car Index" of the number of cars in circulation provides "a relatively good measure of the number of middle-class households." A BRIC economy is the subject of the Washington Post’s "Returning Migrants Boost Mexico’s Middle Class" -- a look at how immigrants’ savings are being used back home. In Africa, progress could be hampered by jobless growth and growing numbers of jobless young people, according to "Generation U – Africa’s Era of Unemployment."