Popular Science: The quickest way to slow the melting of Arctic sea ice is through reducing soot emissions, according to a new study of soot’s climate effects. Eliminating soot entirely could undo nearly a century of global warming, the study says. Stanford researcher Mark Z. Jacobson is the latest in a line of scientists to suggest reducing soot to slow global warming. He says it is second only to carbon dioxide in its ability to warm the climate — it’s even more powerful than methane, according to …