Here are several articles and web resources about world population reaching 7 billion. The United Nations has designated Oct. 31, 2011, as the day that world population reached 7 billion.

As World Passes 7 Billion Milestone, UN Urges Action to Meet Key Challenges (United Nations)

Beyond 7 Billion: Innovation and the Future of Population Growth (Washington Post)

China’s 1-Child Policy Attacked (Hindustan Times)

World Population to Hit 7 Billion (The Hindu)

World Population Hits 7 Billion (USA Today)

7 Billion (National Geographic Magazine)

National Geographic Magazine Marks World’s 7 Billionth Person With New App for iPad

Seven Big Problems for 7 Billion People (MSNBC)

7 Billion Reasons to Empower Women (CNN)

Population 7 Billion: UN Sets Out Challenges (BBC)

Curb Soaring Population Growth? Keep Girls In School (Los Angeles Times and Reuters),0,7335342.story

7 Billion Stories

What’s Your Number? (PAI)

A Global Push to 7 Billion People (Washington Post)