The Galapagos Islands-Nature’s Laboratory

Legions of tourists who visit the GalApagos each year have helped and hurt the islands' delicate ecosystem. But despite laws to protect the Galapagos, increased land and sea tourism, population growth (which brings pollution...

Antarctica-The Frozen Continent

In Antarctica, global warming is raising sea temperatures, melting sea ice, and threatening marine life and four penguin species by destroying habitat and disrupting the food chain. Antarctica has also become an increasingly popular...

Mount Kilimanjaro-Snow Today, But Tomorrow?

The famous snows of Kilimanjaro are melting and may soon be gone. A combination of evaporation, too little snowfall, and internal heat from the dormant volcano have reduced the mountain's ice and snow cover...

The Vredefort Dome-Scar of an Ancient Asteroid

The Vredefort Dome in South Africa offers a unique record of the earth's geological history, which is crucial to our understanding of the planet's evolution. Erosion and geological activity that have destroyed other asteroid-impact...

The Dead Sea-Doing the Dead Sea Float

The Dead Sea is drying up because it no longer receives enough water from the Jordan River and other sources to offset the rapid evaporation caused by Israel's arid climate. To save the Dead...

The Burren- Ireland’s Stony Wilderness

The Burren's stony landscape is a fragile environment threatened by both too much and too little human attention. Every year, thousands of people hike the Burren's rocky paths and marvel at the stone relics...

Columbia Icefields-End of the Ice Age?

Global warming is melting the Columbia Icefields, a vital source of fresh water for North America. The glaciers that comprise the Columbia Icefields are receding more each year, and the annual runoff to the...

The Everglades-Choking the River of Grass

A thriving ecosystem filled with rare species, the everglades has lost approximately 50% of its land due to agriculture and urban development. Dwindling water levels and pollution have severely compromised what remains. The number...

Natural Bridge Caverns

The entrance to the Natural Bridge Caverns is a giant sinkhole which is spanned by the caverns' namesake—a 60-foot (18-meter) limestone bridge. A crawlway descends into .1 wonderland of huge chambers, massive limestone columns,...

The Lost Sea

The Lost Sea is the largest underground lake in the United States. It lies deep within a cave system called Craighead Caverns, in the mountains of east Tennessee. The actual caverns have provided shelter...

The Llanos

The Llanos is a seasonally flooded grassland that covers nearly one-third of Venezuela and more than one-eighth of Colombia. It is most flooded in the central part which occurs on the huge saucer-shaped depression...

Guacharo Caves

This cave system in the Caripe Mountains of Venezuela was discovered in 1799 by the famous explorer Alexander von Humboldt, who not only found the caverns intriguing, but also its inhabitants. Led by a...