Axios

Advanced economies are emitting less carbon now than at any time since the 1980s.

Why it matters: Even if countries don't achieve their Paris Agreement goals, decarbonization is a long-term trend worth investing in. As countries get richer, they invariably also get cleaner. This week Britain burned no coal for electricity for the first time since the Industrial Revolution.

Climate change is an enormous risk to the economy and markets. If the world manages to solve its collective action problem, investors will cheer — but, as with any major change, there will be winners and losers.

What to watch: Moody's, the ratings agency, is putting together what it calls a "framework to assess carbon risks." Individual companies will be given a carbon transition assessment, or CTA, which measures how well they'll be able to operate in a low-carbon economy.

The National Weather Service in New Orleans warned of "life threatening" flash flooding in the region on Saturday night and Sunday morning, as roads were closed and thousands were left without power amid heavy rain in southeast Louisiana, Mississippi and Texas.

Details: The NWS said there's a moderate risk of excessive rainfall on Sunday from southeastern Louisiana, including New Orleans, eastward to southern Georgia. In Mississippi, a train derailed north of Poplarville because of high water levels, WJTV reports. Flash flood warnings were also issued in southeastern Texas as the storm moved out of that waterlogged region.

A global helium shortage is forcing Party City to close 45 stores nationally, but it could also impact scientists and medical professionals who rely on the gas for equipment and research, reports NBC.

Why it matters: Without helium, doctors wouldn't be able to give their patients noninvasive MRI scans, and scientists need chemical element to pressurize fuel tanks for space travel and satellite instruments, per USA Today. Some scientists are even suggesting a total ban on party balloons to help with the shortage.