2011 brought exceptionally mild winters in most of the U.S., deadly tornadoes in the Midwest and extended drought in the West and Southwest. Kevin Trenberth, distinguished senior scientist at the National Center for Atmospheric Research, discusses the correlation between climate change and extreme weather.
Some 20,000 years ago, the Earth wobbled on its axis. That happens periodically. But according to a new scenario, this particular time, that wobble sparked a chain reaction of events that melted glaciers and led to a gradual warming of the planet.
Tiny particles from power plants and fires help create new clouds, which shade the oceans from the sun. This means changes in sea-surface temperatures. And that has profound effects on weather, influencing the time and amount of rainfall in West Africa, and even the number, strength and path of hurricanes.
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