Everything you've ever heard and might have imagined about Lake Tahoe is true. It is extremely deep, blue, alpine, high-altitude, exclusive feeling, crystal clear. It rests right outside the great Sierra Nevadas and receives tons of clear, fresh mountain melt. Yet, the climate is changing due to human induced activity and the local wildlife and lake waters are changing in response. On our way through yesterday we learned that this area truly is a fragile and threatened ecosystem. Its future is extremely precarious.