MILES O’BRIEN:

And the Associated Press now confirms that the death toll from Harvey has risen to 12.

But as we focus on Texas and Louisiana, nature is also taking a devastating toll elsewhere. Heavy monsoons are paralyzing Mumbai, India, right now. More than 1,200 people have died so far.

Connecting the dots between a global warming and extreme weather is not a simple job for science.

That is the topic of our Leading Edge segment this week.

Scientists are loathe to get ahead of their data, but what they see in Houston fits like a key piece in a giant complex puzzle.