Cumulative greenhouse gasses (GHG) emissions are believed to contribute to an increased greenhouse effect and global climate change, which may result in sea level rise, changes in precipitation, habitat, temperature, wildfires, air pollution levels and changes in the frequency and intensity of weather-related-events. While criteria pollutants and toxic air contaminants are pollutants of regional and local concern; GHG are global pollutants. The primary land-use related GHG are carbon dioxide (CO2), methane (CH4) and nitrous oxides (N2O). The individual pollutant’s ability to retain infrared radiation represents its “global warming potential” and is expressed in terms of CO2 equivalents; therefore CO2 is the benchmark having a global warming potential of 1. Methane has a global warming potential of 21 and thus has a 21 times greater global warming effect per metric ton of CH4 than CO2. Nitrous Oxide has a global warming potential of 310. Emissions are expressed in annual metric tons of CO2 equivalent units of measure (i.e., MTCO2e/yr). The three other main GHG are Hydroflourocarbons, Perflourocarbons, and Sulfur Hexaflouride. While these compounds have significantly higher global warming potentials (ranging in the thousands), all three typically are not a concern in land-use development projects and are usually only used in specific industrial processes.
The primary man-made source of CO2 is the burning of fossil fuels; the two largest sources being coal burning to produce electricity and petroleum burning in combustion engines. The primary sources of man-made CH4 are natural gas systems losses (during production, processing, storage, transmission and distribution), enteric fermentation (digestion from livestock) and landfill off-gassing. The primary source of man-made N2O is agricultural soil management (fertilizers), with fossil fuel combustion a very distant second. In El Dorado County, the primary source of GHG is fossil fuel combustion mainly in the transportation sector (estimated at 70% of countywide GHG emissions). A distant second are residential sources (approximately 20%), and commercial/industrial sources are third (approximately 7%). The remaining sources are waste/landfill (approximately 3%) and agricultural (<1%).
September 2006, Governor Arnold Schwarzenegger signed Assembly Bill (AB) 32,
the California Climate Solutions Act of
2006 (Stats. 2006, ch. 488) (Health & Safety Code, § 38500 et seq.). AB
32 requires a statewide GHG emissions reduction to 1990 levels by the year
2020. AB 32 requires the California Air Resources Board (CARB) to implement and
enforce the statewide cap. When AB 32
was signed, California’s annual GHG emissions were estimated at 600 million
metric tons of CO2 equivalent (MMTCO2e) while 1990 levels
were estimated at 427 MMTCO2e. Setting 427 MMTCO2e as the
emissions target for 2020, current (2006) GHG emissions levels must be reduced by
29%. CARB adopted the AB 32 Scoping Plan in
December 2008 establishing various actions the state would implement to achieve
this reduction. The Scoping Plan recommends
a community-wide GHG reduction goal for local governments of 15%. The Scoping Plan was updated in June 2014,
and using new information on the global warming potential of GHG’s, raised the
2020 emissions target slightly to 431 MMTCO2e.
Senate Bill (SB) 97, enacted in 2007, amended the CEQA
statute to establish that GHG emissions and their effects are a prominent
environmental issue that requires analysis and identification of feasible
mitigation under CEQA. GHG was included in the CEQA Guidelines on March 18,
In June 2008, the California Governor’s Office of Planning
and Research’s (OPR) issued a Technical Advisory
providing interim guidance regarding a proposed project’s GHG emissions and contribution
to global climate change. In the absence of adopted local or statewide
thresholds, OPR recommends the following approach for analyzing GHG
emissions: Identify and quantify the project’s
GHG emissions, assess the significance of the impact on climate change; and if
the impact is found to be significant, identify alternatives and/or Mitigation
Measures that would reduce the impact to less-than-significant levels.
Senate Bill (SB) 375, signed in September 2008, aligns
regional transportation planning efforts, regional GHG reduction targets, and
land use and housing allocations. SB 375 requires Metropolitan Planning
Organizations (MPOs) to adopt a Sustainable Communities Strategy (SCS) or
Alternative Planning Strategy (APS), which will prescribe land use allocations
in that MPO’s Regional Transportation Plan (RTP). On April 19, 2012, SACOG
adopted its 2035 Metropolitan Transportation Plan and associated SCS to meet
the requirements of SB 375.
Climate Change is a national and international issue and efforts are being taken and actions implemented on many fronts. The list below shows some of the activities underway.
On March 25, 2008, the El Dorado County Board of Supervisors adopted the “Environmental Vision for El Dorado County” Resolution No. 29-2008, brought forward by the Youth Commission. The Resolution sets forth goals and calls for implementation of positive environmental changes to reduce global impact, improve air quality and reduce dependence on landfills, promote alternative energies, increase recycling, and encourage local governments to adopt green and sustainable practices.
Climate Change Strategy Group: Charter members included the air districts of Sacramento Area, SMUD, California Air Resources Board (CARB), Sacramento Area Council of Governments (SACOG), City of Sacramento, and County of Sacramento. The purpose of the group is to begin a dialogue regarding what we can do to educate the public and implement specific GHG-reducing measures. SACOG Climate Change & Air Quality Committee. SACOG's involvement in the more traditional air quality issues of ozone and particulate matter has been a key work project for many years, therefore the issue of climate change is a timely one for SACOG. The Committee shall develop recommendations for the full SACOG Board of Directors relative to air quality, energy conservation, climate change and related issues.
You can make an important personal choice to reduce your GHG emissions.The Union of Concerned Scientists lists ten smart choices:
You can calculate what is known as your "Carbon Footprint". This is the amount of GHG you produce in units of CO2. Once you have calculated your Carbon Footprint you can take steps to reduce it and/or offset it. Web sites that offer calculation tools and more suggestions for reducing and offsetting include the following:
Thank you for working with us to improve air quality