Vital Signs of the Planet: Evidence. The Earth's climate has changed throughout history. Just in the last 6. Most of these climate changes are attributed to very small variations in Earth’s orbit that change the amount of solar energy our planet receives. This body of data, collected over many years, reveals the signals of a changing climate. The heat- trapping nature of carbon dioxide and other gases was demonstrated in the mid- 1. Their ability to affect the transfer of infrared energy through the atmosphere is the scientific basis of many instruments flown by NASA. There is no question that increased levels of greenhouse gases must cause the Earth to warm in response. Ice cores drawn from Greenland, Antarctica, and tropical mountain glaciers show that the Earth’s climate responds to changes in greenhouse gas levels. They also show that in the past, large changes in climate have happened very quickly, geologically- speaking: in tens of years, not in millions or even thousands. The evidence for rapid climate change is compelling: Sea level rise. Global sea level rose about 1. The rate in the last decade, however, is nearly double that of the last century. Image: Republic of Maldives: Vulnerable to sea level rise. Global temperature rise. All three major global surface temperature reconstructions show that Earth has warmed since 1. Most of this warming has occurred since the 1. Even though the 2. Warming oceans. The oceans have absorbed much of this increased heat, with the top 7. Fahrenheit since 1. Shrinking ice sheets. The Greenland and Antarctic ice sheets have decreased in mass. Data from NASA's Gravity Recovery and Climate Experiment show Greenland lost 1. Antarctica lost about 1. Image: Flowing meltwater from the Greenland ice sheet+ more. An indicator of the current volume and the Antarctica and Greenland ice sheets using data from NASA’s Grace satellite. Arctic sea ice extent both affects and is affected by global climate change. How much do you know about how water is cycled around our planet and the crucial role it plays in our climate? The amount of carbon dioxide absorbed by the upper layer of the oceans is increasing by about 2 billion tons per year. Decreased snow cover. Satellite observations reveal that the amount of spring snow cover in the Northern Hemisphere has decreased over the past five decades and that the snow is melting earlier. LA Marathon, Los Angeles Marathon, L.A. Marathon, City of Los Angeles, and the City of Los Angeles Marathon logo are registered trademarks of the City of Los Angeles. On the Mediterranean Sea. The moon is but a faint sliver on this early July morning and, without its glow, sky and sea meld into a darkness so deep that before John Hamilton can clearly see the people he has come to save, he.
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