At a glance, images of the forest fire raging in Arizona and the volcano erupting in Chile seem to suggest they are filling the atmosphere with gases and debris that will mess with the global climate, but experts say this week’s events, in isolation, aren’t much to worry about.

The Willow fire in Arizona has charred at least 336,000 acres so far, filling the atmosphere with smoke, soot, and the greenhouse gas carbon dioxide. It joins a string of fires that have raged elsewhere in the U.S., including Texas and Florida.