to move up and down
Pigeons fly during a dust storm in Kuwait City, in this file picture taken April 30, 2008. The world’s population will reach seven billion on October 31, 2011, according to projections by the United Nations. The environment provides trillions of dollars in benefits to the global economy, the United Nations says, yet many of these benefits are under threat from pollution, deforestation, climate change and over-extraction as seven billion people consume more of the Earth’s finite resources. Mankind’s immense pressure on the planet is causing the fastest extinction of species in millions of years and is rapidly heating up the planet, threatening more extreme weather. REUTERS/Stephanie McGehee/Files
People walk past an apartment complex in Jakarta October 21, 2011. The world’s population will reach seven billion on 31 October 2011, according to projections by the United Nations, which says this global milestone presents both an opportunity and a challenge for the planet. While more people are living longer and healthier lives, says the U.N., gaps between rich and poor are widening and more people than ever are vulnerable to food insecurity and water shortages. REUTERS/Supri
Neon signs are illuminated in Mong Kok district in Hong Kong, October 4, 2011. Mong Kok has the highest population density in the world, with 130,000 in one square kilometre. The world’s population will reach seven billion on 31 October 2011, according to projections by the United Nations, which says this global milestone presents both an opportunity and a challenge for the planet. While more people are living longer and healthier lives, says the U.N., gaps between rich and poor are widening and more people than ever are vulnerable to food insecurity and water shortages. Picture taken with a long exposure and lens zoom effect. Picture taken October 4, 2011. REUTERS/Bobby Yip
