"...she doesn't deny the basic principles of climate change.
"'If all other things remain equal, it's clear that adding more carbon dioxide to the atmosphere will warm the planet,' she told the committee.
"But, she went on, not all things are equal. She says there's so much uncertainty about the role of natural variation in the climate that she doesn't know what's going to happen. She says a catastrophe is possible, but warming could also turn out to be not such a big deal.
"And she focuses on uncertainties and unknown unknowns far more than on the consensus of climate scientists, who say we know enough to be deeply worried.
"'I've been trying to understand how there can be such a strong consensus, given these uncertainties,' she told the committee."