The Third National Climate Assessment (NCA) was released on May 6, 2014 by the White House. The assessment documents how climate change impacts regions and sectors across the United States, and how society is responding to climate change.
In a stable climate, the ratio of new record highs to new record lows is approximately even. However in our warming climate, record highs have begun to outpace record lows, with the imbalance growing for the past three decades. This trend is one of the clearest signals of climate change that we experience directly.
Noted climate scientist Michael Mann discusses the scary reality that human greenhouse gas emissions are currently overcoming natural forcings, as well as the current confusion around surface warming, climate models, and natural variability.
Right now, the eastern United States is seeing a cold snap, which could cause some to wonder whether the world is still warming