While no current legislation limits the GWP of refrigerants in the US, the Environmental Defense Fund has proposed a bill that would tackle high GWP gases first in California, and later hopefully also at the federal level. CO₂ is specifically mentioned as a high-potential replacement.

The US-based organisation Environmental Defense Fund (EDF) has put forward an amended version of Assembly Bill 1373 calling on the California Energy Commission (CEC) and the California Air Resources Board (CARB) to develop the necessary studies and incentives to phase out high GWP F-gases. The Bill also calls for the mass adoption of systems using natural refrigerants such as CO₂.

The Environmental Defense Fund advocating for CO₂

"Our top priority is to pass national legislation that caps global warming pollution and creates a flexible emissions trading market. That will open the door to a green technology revolution," argues Steve Cochran, director of EDF national climate campaign.

In this respect EDF along with Assembly member Nancy Skinner have sponsored a bill in the California Legislature that will require thorough analysis of available technologies and identify ways to incentivise the use of environmentally friendly refrigerants like CO₂.

“Systems, using “natural” refrigerants like CO₂ have low greenhouse gas implications and also have the potential to decrease energy consumption compared to the systems they replace,” states the High GWP bill fact sheet written by EDF.

CARB’s current strategy to limit high GWP gases

The California Air Resources Board is proposing to promulgate regulations to limit leaks of high-GWP gases in line with the AB32 rulemaking authority. The following measures are expected to reduce emissions by some 15 million tons by 2020:

Although this is regarded as a step in the right direction, limiting leakage is not strong and binding enough a measure to reduce the circulation of high GWP gases and reduce the foreseen 31 million CO₂ tons to be emitted by 2020.

EDF’s bill

The bill will require the California Energy Commission to study alternative solutions such as CO₂ systems in order to update building and appliance standards. The Commission would examine the energy efficiency and environmental impact of cooling systems.

The commission will then produce a report outlining the most environmentally sound technologies and assess these in terms of economic and technological feasibility. Pilot projects will then be developed to test the new technologies.

Background

As part of the 2006 Global Warming Solutions Act, CARB has created a state wide GHG emissions inventory targetting the major sources of global warming pollution. The inventory suggests that emissions of high high-GWP gases are expected to grow from nearly 15 MMTCO₂e in 2004 to more than 45 MMTCO₂e by 2020 if no action is taken. With most of this growth attributed to the increased use of HFCs that replace HCFCs being phased out under the Montreal Protocol.

Source: R744.com

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