... Earth could not be sustained without the natural greenhouse effect. 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 ... next one hundred years. This may not sound like much, but it could change the Earth's climate as never before. At the peak of the last ice age (18,000 years ago), the temperature was only 7 ∘F colder than it is today, and glaciers covered much of North America! Even a ... the sam...

• Word Count: 3240
• Approx Pages: 13
• Grade Level: Undergraduate