Bathed in a curtain of life-giving fog and mist, the Monteverde cloud forest in the mountains of Costa Rica is a profusion of dripping green that stands as an international model of conservation gone right. But despite Monteverde's tens of thousands of protected acres, scientists say this tropical luxuriance, beloved by biologists and eco-tourists alike, may be at risk: the clouds that bathe the mountains seem to be disappearing. The problem, scientists say, is deforestation, but not within Monteverde's vast network of reserves.