https://www.sandiegouniontribune.com/sdut-1n27coal23479-coal...
You'll get the best wok hei. FYI, https://en.wikipedia.org/wiki/Wok#Wok_hei
Berkeley is only 31 miles away from a business called Koch Carbon. The name alone tells you all you need to know. You can buy carbon from the Koch brothers. By banning natural gas in new homes, Berkeley is supporting this local business.