California sues 6 carmakers over greenhouse gases
California's regulations to limit greenhouse gases from vehicles through its California Air Resources Board (CARB) have often caused friction between the state and automakers. California, with an estimated 26 million vehicles on the road, often sets automotive and environmental trends because it accounts for 10% of national auto sales. Automakers frequently incorporate the more restrictive California requirements into the whole fleet rather than producing different versions of the same vehicle for California and other states that adopt its policies.
[Sources: Reuters, CARB]
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