A lawsuit was filed in federal district court today against the first significant update to environmental protection standards at Lake Tahoe since 1987.The deadline for challenges to the plan was midnight Tuesday.The plaintiffs, the Sierra Club and the Friends of the West Shore, filed suit against the updates to the Lake Tahoe Regional Plan that were approved by the TRPA Governing Board in December.TRPA Executive Director Joanne Marchetta said the Sierra Club's action goes against current scientific and sustainability principles, including those that the National Sierra Club has endorsed in published reports, and delays policy improvements needed to save the …