… State and federal agencies, nonprofits and other groups have spent more than $3 billion over the past quarter century for more than 800 projects that aimed to protect and improve (Lake Tahoe) and its environs. And public investment is accelerating: Congress recently reauthorized the Lake Tahoe Restoration Act, allocating $300 million for an array of projects for another 10 years. Work the region has prioritized for the next five years is estimated to cost more than $2 billion in federal, state, local and private funds. But despite all of the billions lavished on Lake Tahoe, questions remain about whether all of this funding and attention have actually improved the quality of the lake and its surrounding environment.