Ok what part of warming don’t we understand?
Check this out:

The Obama administration is pushing back against skeptics who claim this week’s “polar vortex” of cold weather is proof global warming is a myth, saying weather patterns such as these are actually a result of climate change.

In a post on the official White House blog Wednesday, the administration starts by saying no single weather event proves or disproves climate change.

“If you’ve been hearing that extreme cold spells, like the one we’re having in the United States now, disproves global warming, don’t believe it,” Dr. John Holdren, President Obama’s science adviser, says in a video included in the blog post.

However, the White House says extreme cold spells can actually be attributed to global warming, and that such weather patterns will likely appear with more frequency as climate change continues.