“The models that have been constructed agree that when, as has been predicted, the level of carbon dioxide or its equivalent in other greenhouse gases doubles from pre-Industrial Revolution concentrations, the global average temperature will increase, and that the increase will be 1.5 to 4.5 degrees Celsius or 3 to 8 degrees Fahrenheit... In Dallas, for instance, a doubled level of carbon dioxide and other gases like methane, would increase the number of days a year with temperatures above 100 degrees from 19 to 78 each year.” YearsHas BeensLevelsNumbersRevolutionDegreesModelsIncreaseAgreeAverageInstanceGlobal WarmingConcentrationCarbonTemperatureGreenhousesDallasCarbon DioxideIndustrial RevolutionGreenhouse GasesMethane Author:Bill McKibben
“It's worth remembering that all technology leaves a footprint. For example, our own technology is leaving a footprint in terms of global warming, which could be detected from a long way away. One assumes that a very advanced civilization that has been around maybe millions and millions of years would have an even bigger footprint that might extend beyond its planet to its immediate astronomical environment.” WayYearsLongHas BeensMightRememberTermMillionsTechnologyEnvironmentExamplePlanetsCivilizationBiggerAssumingLeavingGlobal WarmingLong WayFootprintAdvanced Civilization Author:Paul Davies