A leading Dutch environmental agency, taking the blame for one of the glaring errors that undermined the credibility of a seminal U.N. report on climate change, said Monday it has discovered more small mistakes and urged the panel to be more careful.

But the review by the Netherlands Environmental Assessment Agency claimed that none of the errors effected the fundamental conclusion by U.N. panel of scientists: that global warming caused by humans already is happening and is threatening the lives and well-being of millions of people.