At Saturday's annual meeting of Berkshire Hathaway shareholders, the company's chairman and CEO Warren Buffett fielded a question as to whether the recent shakiness had presented Berkshire with opportunities to buy stock.

But although that was the talk of the markets, there were plenty of other interesting updates at the meeting, including an ominous warning from Buffett to investors. Let's talk about what Buffett said and how to prepare.

"Berkshire Hathaway Energy is worth considerably less money than it was two years ago based on societal factors," Warren Buffett said.