According to a 2014 report by the Convention on Biological Diversity, "it is now nearly inevitable" that within 50-100 years continued human produced CO2 emissions will increase ocean acidity to levels that "will have widespread impacts, mostly deleterious, on marine organisms and ecosystems." According to an Oct.
2013 study, the middle depths of the Pacific Ocean have warmed "15 times faster in the last 60 years than they did during apparent natural warming cycles in the previous 10,000." About a quarter of the globe's glacial loss from 1851-2010, and approximately two thirds of glacial loss between 1991-2010, is attributable directly to global warming caused by human-produced greenhouse gases.
Acidity levels in the oceans are 25-30% higher than prior to human fossil fuel use.
According to a 2014 US Government Accountability Office (GAO) report, oceans have absorbed about 30% of the CO2 emitted by humans over the past 200 years, and ocean acidity could rise approximately 100-200 percent above preindustrial levels by 2100.
According to the National Snow and Ice Data Center, global warming from human-produced greenhouse gases is a primary cause of the "unprecedented" retreat of glaciers around the world since the early 20th century.
According to a 2013 IPCC report, "glaciers have continued to shrink almost worldwide" over the prior two decades, and there is "high confidence" (about an 8 out of 10 chance) that Northern Hemisphere spring snow continues to decrease.According to the US Geological Service, this disruption can include the "extinction of temperature sensitive aquatic species." , there is a "high degree of confidence" that the Texas and Oklahoma heat waves and drought of 2011, and heat waves and drought in Moscow in 2010, "were a consequence of global warming" and that "extreme anomalies" in weather are becoming more common as a direct consequence of human-caused climate change.Higher temperatures from global warming are also causing some mountainous areas to receive rain rather than snow.Melting glaciers also change the climate of the surrounding region.With the loss of summer glacial melt water, the temperatures in rivers and lakes increase.As sunlight hits the earth, some of the warmth is absorbed by greenhouse gases in the atmosphere such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (NO2).These gases trap heat and cause the planet to warm through a process called the greenhouse effect.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.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.They contend that warming over the 20th century resulted primarily from natural processes such as fluctuations in the sun’s heat and ocean currents.They say the theory of human-caused global climate change is based on questionable measurements, faulty climate models, and misleading science.