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The article reports that California plans to sue the U.S. Environmental Protection Agency (EPA) in 2007 to force the EPA to act on the state's plans to impose restrictions on greenhouse gas emissions from new trucks and cars. It includes an analysis of the complex legal issues surrounding the possible lawsuit, as well as the issues' implications for environmental policy.

Reports on California's setting of a drinking-water standard for perchlorate, a component of solid rocket fuel. Possibility that the action could lead to expensive groundwater cleanups in the state; California Environmental Protection Agency's setting of a public health goal of six ppb as the level of perchlorate in drinking water that does not pose a significant risk to human health.