A sharp rise in visitors to the Galápagos Islands and the accompanying economic development are threatening the islands' fragile ecosystem. Since 1990, the number of visitors to the islands has more than tripled. Non-native plants brought to the islands now outnumber native species.
Called a "living museum" by UNESCO, the Galápagos are where Charles Darwin made historic observations key to the theory of evolution.
A report from the Charles Darwin Foundation on the health of the Galápagos can be found here.