“But the debate is settled. Climate change is a fact,” said President Barack Obama in his 2014 State of the Union address. Saying the debate is settled is nonsense, but the president is right about climate change. GlobalChange.gov gives the definition of climate change: “Changes in average weather conditions that persist over multiple decades or longer. Climate change encompasses both increases and decreases in temperature, as well as shifts in precipitation, changing risk of certain types of severe weather events, and changes to other features of the climate system.” That definition covers all weather phenomena throughout all 4.54 billion years of Earth’s existence.