Canada’s leading retailer, has opened the country’s first superstore using a secondary CO2 system for refrigeration. This might “change the face of Canadian grocery retail.”

The Environmental Protection Agency blocks the use of the natural refrigerant CO2 in US cars. And: carmakers are thinking about using a flammable chemical with unknown long-term environmental effects.

All carmakers should use the natural refrigerant CO2 to spare the planet a big chunk of the 27 billion tones of greenhouse gases coming only from the car air conditioning.