Earth in Peril

Population Density, 2000
It's not difficult to see where on Earth the human footprint is having the greatest impact. The world's population today is estimated at 6.3 billion—up from two billion in 1930—with the highest population densities in India, population 1.1 billion, China, population 1.3 billion, Indonesia, population 220 million, and central Europe, population 630 million.