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The greenhouse effect has kept the Earth's average temperature a good deal higher for billions of years, making it possible for life as we know it to evolve Over the past several millennia the average Earth temperature has been about 15 °C (59 °F) The figure below illustrates how greenhouse gases keep the Earth warmer than it would be without them Energy from the sun is shown on the The 'greenhouse effect' in cars Published at 258 AM MST Updated at 410 PM MST TUCSON, AZ (Tucson News Now) It's only early April, but we've already had our first report of an infant found in a hot car in Tucson We talk about this every Spring and Summer in Arizona the dangers of cars heating up in the sun Afternoon temperatures are The greenhouse effect is the way in which heat is trapped close to Earth's surface by "greenhouse gases" These heattrapping gases can be thought of as a blanket wrapped around Earth, keeping the planet toastier than it would be without them Green...