Rivka Killmer: The sun. At least according to NASA
Luke Gacusan: Watch these videos and you will have way more firepower than you need to show humans didn't cause the current warming trend. These are top climate scientists and they say man-made Global Warming is a scam.The Great Global Warming Swindlehttp://www.youtube.com/watch?v=YaTJJCPYhlk
Cortez Badolato: First answer on Google I found isVolcanoes, wobbly earth and sun spots. Methane gas released from the arctic wetlands and tundraI saw a History Channel on this, its one of the best and most interesting shows I have ever watched.studies show that solar variability has played a role in past climate changes. For example, a decrease in solar activity is thought to have triggered the Little Ice Age between approximately 1650 and 1850, when Greenland was largely cut off by ice from 1410 to the 1720s and glaciers advanced in the Alps....Show more
Jerrod Guilfoil: There are all kinds. Volcanic eruptions, Ca! rbon monoxide, animal respiration which creates carbon dioxide, and increased out put by the Sun.The sun is called a white dwarf star and if feeds on hydrogen and helium. It will grow larger and burn up many things. The cycle of weather patterns also cause this.Burning fossil fuels too because it releases carbon dioxide into the air....Show more
Sammie Bocanegra: >If you actually want to win that debate, best not to claim that global warming is occurring 'slightly faster because of humans' because that is factually incorrect. In past 'natural' episodes of global warming, the increase in average global temperature took thousands of years. "When global warming has happened at various times in the past two million years, it has taken the planet about 5,000 years to warm 5 degrees. The predicted rate of warming for the next century is at least 20 times faster. This rate of change is extremely unusual." (1)And regarding the natural vs human component:"...natural causes ar! e still in play today, but their influence is too small or the! y occur too slowly to explain the rapid warming seen in recent decades. We know this because scientists closely monitor the natural and human activities that influence climate with a fleet of satellites and surface instruments." (2)As for the natural components themself, NASA lists them as following:"Most often, global climate has changed because of variations in sunlight. Tiny wobbles in Earth’s orbit altered when and where sunlight falls on Earth’s surface. Variations in the Sun itself have alternately increased and decreased the amount of solar energy reaching Earth. Volcanic eruptions have generated particles that reflect sunlight, brightening the planet and cooling the climate. Volcanic activity has also, in the deep past, increased greenhouse gases over millions of years, contributing to episodes of global warming." (2)Bottom line: there are natural causes (aka 'forcings' in climate science) which explain part of the global warming but certainly not all of it nor ! the rate (= time-scale) of warming which is currently being observed.More factual information (from real climate scientists, not people pretending to be) can be found at:The National Center for Atmospheric Research: http://www.eo.ucar.edu/basics/cc_3.htmlThe National Oceanic and Atmospheric Administration: http://www.research.noaa.gov/climate/t_observing.h...The (US) National Academy of Sciences: http://dels-old.nas.edu/climatechange/understandin...The British Antarctic Survey: http://www.antarctica.ac.uk/bas_research/science_b......Show more
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