Weather stations, balloons, ocean buoys, and satellites tell us the Earth’s temperature today. Ice cores, sediment layers, and tree rings tell us about what the Earth’s climate has been like in the past. With this evidence, scientists are learning how climate changes over time.

Climate is the long-term average of a region's weather events lumped together. Climate change represents a change in these long-term weather patterns. They can become warmer or colder. Annual amounts of rainfall or snowfall can increase or decrease. Human activities are increasing greenhouse gas concentrations and trapping more heat. The Earth’s climate is predicted to change due to the buildup of greenhouse gases; the associated rate of temperature cha

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