Grist: We`ve discussed at length how global warming can make wildfires worse. But here`s some more bad news: New research suggests that the fires themselves could be worsening global warming. Forest fires release carbon from burned trees and leaves into the atmosphere. Some of that carbon is released as carbon dioxide, the chief greenhouse gas. But a lot of it is spewed into the air as soot and clumps of black carbon known as tar balls. Soot doesn`t necessarily warm the globe - some if it can actually...