: The news from this giant volcano suggests world economy getting worse — and the U.S. may be to blame

When MarketWatch last reported on data from the Mauna Loa Observatory, it painted a pretty grim story of the global economy, in April.

That observatory, on the world’s second-largest volcano, measures carbon dioxide in the atmosphere. And the decline in the 12-month average of the year-over-year change in parts per million of atmospheric carbon dioxide preceded the declines in economically sensitive commodities like oil CL.1 and copper HG00.

Now…