Did Klaus Schwab tweet that there are coming food shortages and that his World Economic Forum is working with the Biden administration to ensure that most people survive? No, that's not true: This is a tweet from a fake Twitter account that is not Klaus Schwab's. The parody Twitter account has been suspended.
A screenshot of this fake tweet from November 12, 2020, has been circulating on social media for months. One example is this post (archived here) published on Facebook on February 11, 2021. The original fake tweet opened:
The World Economic Forum are working with the Biden Administration to ensure that most people will survive the coming food shortages.
Citizens that have up-to-date vaccination documents will receive regular packages of plant-based protein products
This is what the post looked like on Facebook at the time of writing:
(Source: Facebook screenshot taken on Mon Mar 1 20:43:02 2021 UTC)
The real account of Klaus Schwab, founder of the World Economic Forum, has a blue check-mark, Twitter's indication it has verified a famous person's account and the handle is @ProfKlausSchwab.
The fake account named @_Klaus_Schwab has been deleted.
(Source: Twitter screenshot taken on Mon Mar 1 4:05 2021 EST)