The Sierra Club Loma Prieta Chapter and the Santa Clara Valley Bird Alliance have submitted a joint letter to the Palo Alto City Council urging amendments to the draft Dark Sky ordinance, which is set to be discussed on April 7. The organizations emphasize the need for more comprehensive measures to control light pollution, highlighting the adverse effects of excessive artificial lighting on environmental and human health. Their letter critiques the proposed ordinance for not fully incorporating recommendations made by the Planning and Transportation Commission (PTC) in October, particularly regarding the applicability of lighting standards to existing and replacement fixtures. They advocate for specific changes including the reinstatement of broader applicability for lighting curfews, stricter light trespass thresholds, and protections for sensitive ecosystems. The groups argue that these amendments align with best practices adopted by other California cities, aiming to mitigate the impacts of light pollution and enhance community well-being.