"Use the slider to compare 1990 false-color Landsat views (left) with recent true-color imagery (right). Humans are increasingly transforming Earth's surface-through direct activities such as farming, mining, and building, and indirectly by altering its climate."
"The world is increasingly going hi-tech. Many people in our high consumption society want the latest and the greatest; last year's much anticipated laptops and cell phones are miles behind the newest models that are coming out. So what happens with the old models? "