The project to build a giant tunnel in California to catch more water for storage is estimated to cost over $20 billion, up from $16 billion previously. This cost increase is mainly due to inflation after the pandemic, with hopes of better preparing for longer droughts due to climate change.
Although the project is anticipated to bring benefits of $38 billion primarily by bolstering the water supply, environmental groups argue it would severely impact the Sacramento-San Joaquin River Delta's ecosystem, housing endangered species like salmon.
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