California has stepped up its attempts to reduce greenhouse gas emissions by setting tough new targets for 2030.
Governor Jerry Brown issued an executive order to bring down emissions to 40% below 1990 levels, in the next 15 years.
The US state was already one of the most ambitious in its previous targets and has forced companies to pay for their carbon pollution.
Mr Brown said the new target must be met for the sake of future generations.
He called the plan “the most aggressive benchmark enacted by any government in North America to reduce dangerous carbon emissions”.
There were few details about how he intends to meet this target, but the governor has previously talked about increasing renewable electricity sources, reducing petrol use in vehicles and improving the energy efficiency of existing buildings.
Mr Brown mentioned by name some sectors that will have to reduce emissions – industry, agriculture and energy, plus state and local governments.
“With this order, California sets a very high bar for itself and other states and nations, but it’s one that must be reached – for this generation and generations to come,” he said in a statement.
California is the second-biggest producer of carbon dioxide through fossil fuels among US states.
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