This winter is the first in four years that El Niño has been active as winter begins. Here's how it will impact weather in the U.S., according to NOAA.
Catherine Clifford is a climate innovation and tech reporter for CNBC. With a focus on national news in the United States, Catherine covers topics such as renewable energy, climate policy, and clean technology. Her work has been featured in various publications and media outlets, including NBC New York, FRANCE 24, and Yahoo News.