San Francisco Chronicle: The report from an international team of climate scientists concludes that climate change in the Arctic has accelerated since the Industrial Revolution, abruptly reversing a long-term worldwide cooling trend. “The study provides a clear example of how increased greenhouse gases are now changing our climate,” said Caspar Ammann of the National Center for Atmospheric Research in Boulder, Colo., a co-author of the report published Thursday in the journal Science. To deduce the …