The Global Warming Solutions Act of 2006 is an environmental law in California, signed into law by Governor of California Arnold Schwarzenegger on September 27, 2006.

The bill establishes a timetable to bring California into near compliance with the provisions of the Kyoto Protocol.

It requires that by 2020 the state's greenhouse gas emissions be reduced to 1990 levels, a roughly 25% reduction under business as usual estimates. The California Air Resources Board, under the California Environmental Protection Agency, is to prepare plans to achieve the objectives stated in the Act.

As defined in the bill, “greenhouse gases” include all of the following gases:
Carbon Dioxide (CO2), Methane (CH4), Nitrous Oxide (N2O), hydrofluorocarbons (HFCs), Perfluorocarbons (PFCs), and Sulphur hexafluoride (SF6).

These are the same gases listed as Greenhouse Gases (GHGs) in the Kyoto Protocol.