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Man-Made Global Warming Isn't Real

I will begin with a few statistics and quotes from experts showing, unequivocally, that global warming has occurred. I will then move on to show that this effect is largely a result of human actions, technology, and the like. Next, I will provide quotes and sources specifically stating that the current level(s) of global warming could not be results of natural causes. Finally, I will address some of the arguments Pro is likely to make. I will point out that, at least in the past, he/she references sites such as "Right Wing News" and "Breitbart", sources known to be some of the most biased that exist. On the other hand, the sources I reference are scholarly, scientific, and largely non-partisan. As the BoP is on Pro and he/she stated "man-made global warming isn't real", he/she will have to prove beyond a reasonable doubt (and refute all counter-claims on this topic) that none of the global warming that has occurred has resulted from human action. If even some of it has resulted from human action, it would, by definition, be "real". Global Warming Occurring - "Scientific evidence for warming of the climate system is unequivocal." - Intergovernmental Panel on Climate Change - The planet's average surface temperature has risen about 1.62 degrees Fahrenheit (0.9 degrees Celsius) since the late 19th century, a change driven largely by increased carbon dioxide and other human-made emissions into the atmosphere. Most of the warming occurred in the past 35 years, with the five warmest years on record taking place since 2010. - The Greenland and Antarctic ice sheets have decreased in mass. Data from NASA's Gravity Recovery and Climate Experiment show Greenland lost and average of 281 billion tons of ice per year between 1993 and 2016, while Antarctica lost about 119 billion tons during the same time period. The rate of Antarctica ice mass loss has tripled in the last decade. - Glaciers are retreating almost everywhere around the world — including in the Alps, Himalayas, Andes, Rockies, Alaska and Africa. - 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. - Global sea level rose about 8 inches in the last century. The rate in the last two decades, however, is nearly double that of the last century. - The number of record high temperature events in the United States has been increasing, while the number of record low temperature events has been decreasing, since 1950. - The Greenland and Antarctic ice sheets have decreased in mass. Data from NASA's Gravity Recovery and Climate Experiment show Greenland lost and average of 281 billion tons of ice per year between 1993 and 2016, while Antarctica lost about 119 billion tons during the same time period. The rate of Antarctica ice mass loss has tripled in the last decade. - Each of the last three decades has been successively warmer at the Earth’s surface than any preceding decade since 1850 - "The danger is that global warming may become self-sustaining, if it has not done so already. The melting of the Arctic and Antarctic ice caps reduces the fraction of solar energy reflected back into space, and so increases the temperature further. Climate change may kill off the Amazon and other rain forests, and so eliminate once one of the main ways in which carbon dioxide is removed from the atmosphere. The rise in sea temperature may trigger the release of large quantities of carbon dioxide, trapped as hydrides on the ocean floor. Both these phenomena would increase the greenhouse effect, and so global warming further. We have to reverse global warming urgently, if we still can." - Stephen Hawking - Evidence from ocean sediments, ice cores, tree rings, sedimentary rocks and coral reefs show that the current warming is occurring 10 times faster than it did in the past when Earth emerged from the ice ages, at a rate unprecedented in the last 1,300 years. Sources: https://climate.nasa.gov... https://www.ncdc.noaa.gov... http://www.cru.uea.ac.uk... http://data.giss.nasa.gov... Levitus, et al, "Global ocean heat content 1955–2008 in light of recently revealed instrumentation problems," Geophys. Res. Lett. 36, L07608 (2009). http://nsidc.org... https://www.jpl.nasa.gov... http://blogs.ei.columbia.edu... IPCC Climate Change 2013: The Physical Science Basis Humans Are (at least partially) To Blame - "It is 'extremely likely that more than half of the observed increase in global average surface temperature' from 1951 to 2010 was caused by human activity. By 'extremely likely', it meant that there was between a 95% and 100% probability that more than half of modern warming was due to humans. - Intergovernmental Panel on Climate Change’s (IPCC) fifth assessment report. - "Between 93% to 123% of observed 1951-2010 warming was due to human activities." - US Fourth National Climate Assessment - "Scientists Agree: Global Warming is Happening and Humans are the Primary Cause" - UCSUSA - "Human influence on the climate system is clear, and recent anthropogenic emissions of green-house gases are the highest in history. […] Warming of the climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia." - IPCC AR5 - "Of all the radiative forcings analysed, only increases in greenhouse gas emissions produce the magnitude of warming experienced over the past 150 years." - Berkeley Earth - "Today, CO2 levels are 40 percent higher than they were before the Industrial Revolution began; they have risen from 280 parts per million in the 18th century to over 400 ppm in 2015 and are on track to reach 410 ppm this spring. In addition, there is much more methane (a greenhouse gas 84 times more potent than CO2 in the short term) in the atmosphere than at any time in the past 800,000 years—two and a half times as much as before the Industrial Revolution. While some methane is emitted naturally from wetlands, sediments, volcanoes and wildfires, the majority of methane emissions come from oil and gas production, livestock farming and landfills." - Earth Institute, Columbia University - "Today, almost 100 percent [plus or minus 20 percent] of the unusual warmth that we’ve experienced in the last decade is due to greenhouse gas emissions,” - Peter de Menocal, dean of science at Columbia University and founding director of Columbia’s Center for Climate and Life Note: Some of these conclusions have led to some confusion as to how more than 100% of observed warming could be attributable to human activity. A human contribution of greater than 100% is possible because natural climate change associated with volcanoes and solar activity would most likely have resulted in a slight cooling over the past 50 years, offsetting some of the warming associated with human activities. Current Levels of Global Warming Not Natural - "If the sun were brighter, we would see warming all the way up through the atmosphere from the surface to the stratosphere to the mesosphere. We don’t see this. We see instead warming at the surface, cooling in the stratosphere, cooling in the mesosphere. And that’s a signature of greenhouse gas forcing, it’s not a signature of solar forcing. So we know it’s not solar.” - Gavin Schmidt, director of National Aeronautics and Space Administration’s Goddard Institute for Space Studies - "Volcanoes have a short-term cooling effect on the climate due to their injection of sulphate aerosols high into the stratosphere, where they can remain aloft for a few years, reflecting incoming sunlight back into space." - Zeke Hausfather - "Finally, solar activity is measured by satellites over the past few decades and estimated based on sunspot counts in the more distant past. The amount of energy reaching the Earth from the sun fluctuates modestly on a cycle of around 11 years. There has been a slight increase in overall solar activity since the 1850s, but the amount of additional solar energy reaching the Earth is small compared to other radiative forcings examined. Over the past 50 years, solar energy reaching the Earth has actually declined slightly, while temperatures have increased dramatically." - Carbon Brief - “We have independent evidence that says when you put in greenhouse gases, you get the changes that we see. If you don’t put in greenhouse gases, you don’t. And if you put in all the other things people think about—the changes in the earth’s orbit, the ocean circulation changes, El Niño, land use changes, air pollution, smog, ozone depletion—all of those things, none of them actually produce the changes that we see in multiple data sets across multiple areas of the system, all of which have been independently replicated.” - Gavin Schmidt, director of National Aeronautics and Space Administration’s Goddard Institute for Space Studies Potential Pro Argument Based on Pro's past debates on this subject, I know he/she is likely to make following arguments: "https://goo.gl...;Sorry, you were saying..." Many people debate the validity of this statistic/image, but we can put that aside. Global warming is about the long-term trend, not a single year-over-year increase in the size of a particular ice sheet. So, even if this is accurate, it is in no way sufficient in disproving the litany of sources cited above stating the long-term trend. Here is a Forbes article directly speaking to statistics of this nature: https://goo.gl... As stated above, Pro's other arguments often rest on sources such as "Right Wing News" and "Breitbart", a few of the least reliable, least scientific, least objective sources in the world. I would point voters to the much more reputable, scientific, and unbiased sources I have used in my arguments.