As US President Donald Trump prepares to issue executive orders related to energy, assertions by the new head of the country's Environmental Protection Agency (EPA) underscore the extent to which administration thinking has changed in the two months since Barack Obama and his climate-driven energy policies left the White House. Carbon dioxide, Scott Pruitt said last week, is not a "primary contributor" to climate change. "Measuring with precision human activity on the climate is something very challenging to do and there's tremendous disagreement about the degree of impact," he said, when asked on CNBC if carbon dioxide was the "primary control knob" of climate change. Pruitt did, however, admit that the issue warranted more research.
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