CO2 produced by burning fossil… Read MoreCO2 produced by burning fossil fuels such as oil and coal [ ] can be differentiated in the atmosphere from natural CO2 due to its specific isotopic ratio. [ ] According to the Intergovernmental Panel on Climate Change (IPCC), 20th century measurements of CO2 isotope ratios in the atmosphere confirm that rising CO2 levels are the result of human activity, not natural processes such as ocean outgassing, volcanic activity, or release from other carbon sinks. [ ] US greenhouse gas emissions from human activities in 2012 totaled 6. 5 million metric tons, [ ] which is equivalent to about 78. 3 billion shipping containers filled with greenhouse gases. [ ]Average temperatures on earth have increased at a rate far faster than can be explained by natural climate changes. According to a 2009 study in Geophysical Research Letters, natural shifts in the ocean currents are the major cause of these climate changes, not human-generated greenhouse gases. [ ] According to William Gray, PhD, Emeritus Professor of Atmospheric Science at Colorado State University, most of the climate changes over the last century are natural and due to multi-decadal and multi-century changes in deep global ocean currents. [ ] Global cooling from 1940 to the 1970s, and warming from the 1970s to 2008, coincided with fluctuations in ocean currents and cloud cover driven by the Pacific Decadal Oscillation (PDO) - a naturally occurring rearrangement in atmospheric and oceanic circulation patterns. [ ] According to a 2014 article by Don Easterbrook, PhD, Professor Emeritus of Geology at Western Washington University, the PDO cool mode has replaced the warm mode in the Pacific Ocean, virtually assuring us of about 30 years of global cooling, perhaps much deeper than the global cooling from about 1945 to 1977. [ ]Increased hurricane activity and other extreme weather events are a result of natural weather patterns, not human-caused climate change. Contre vents et marées free effect papers, essays, and research papers. As CO2 levels in the atmosphere… Read MoreAs CO2 levels in the atmosphere rise, the amount of additional warming caused by the increased concentration becomes less and less pronounced. [ ] According to Senate testimony by William Happer, PhD, Professor of Physics at Princeton University, [a]dditional increments of CO2 will cause relatively less direct warming because we already have so much CO2 in the atmosphere that it has blocked most of the infrared radiation that it can. According to researchers at the Scripps Institution of Oceanography, up to 60% of the changes in river flow, winter air temperature, and snow pack in the western United States (1950-1999) were human-induced. [ ] Since 1991, heavy precipitation events have been 30% above the 1901-1960 average in the Northeast, Midwest, and upper Great Plains regions. [ ] A 2015 study found that global warming caused by human actions has increased extreme precipitation events by 18% across the globe, and that if temperatures continue to rise an increase of 40% can be expected. [ ]Permafrost is melting at unprecedented rates due to global warming, causing further climate changes. A 2008 study compared data… Read MoreA 2008 study compared data from tree rings, ice cores, and corals over the past millennium with recent temperature records. According to a 2013 IPCC report there… Read MoreAccording to a 2013 IPCC report there is high confidence (about an 8 out of 10 chance) that anthropogenic global warming is causing permafrost, a subsurface layer of frozen soil, to melt in high-latitude regions and in high-elevation regions. [ ] As permafrost melts it releases methane, a greenhouse gas that absorbs 84 times more heat than CO2 for the first 20 years it is in the atmosphere, creating even more global warming in a positive feedback loop. [ ] [ ] By the end of the 21st century, warming temperatures in the Arctic will cause a 30%-70% decline in permafrost. [ ] According to a 2012 report, as human-caused global warming continues, Arctic air temperatures are expected to increase at twice the global rate, increasing the rate of permafrost melt, changing the local hydrology, and impacting critical habitat for native species and migratory birds. [ ] According to the 2014 National Climate Assessment, some climate models suggest that near-surface permafrost will be lost entirely from large parts of Alaska by the end of the 21st century. [ ]More than one thousand scientists disagree that human activity is primarily responsible for global climate change. According to a 2013 report published in the Proceedings of the National Academy of Sciences, the recorded changes in precipitation over land and oceans are unlikely to arise purely due to natural climate variability. [ ] Higher temperatures from global warming are also causing some mountainous areas to receive rain rather than snow.
Cause effect essay global warming.