Global Warming Evidence


This page contains evidence of global warming and climate change. The goal is to provide a repository of links for anyone looking for clear evidence that global warming is happening and that humans are causing it. It consists primarily of direct measurements of temperature change, causes of that change, and effects of that change. It does not focus on the impact of those or how significant they are. Those can be found here.

Temperature Rise

NASA2016 was ~1.8 degrees (F) warmer than the middle (1950) of the 20th century.
Berkeley EarthTemperatures are ~2.7 degrees (F) higher recently than 250 years ago.
NOAA2016 was ~1.7 degrees (F) warmer than 20th century average.
Hadley Center2015 was ~1.5 degrees (F) warmer than the late (1975) 20th century.
Japanese Metrological Agency2016 was ~0.8 degrees (F) warmer than the end of the 20th century (1995).
Australian Bureau of Meteorology2016 was ~1.4 degrees (F) warmer than the late 20th century (1975).
PAGES2k InitiativeProxies show that this period has the highest temperatures of any period in the last 2000 years.
VariousArticle comparing multiple temperature sources and isolating the long-term warming trend

Human Caused/Greenhouse Effect

NASAVisualization comparing all causes for temperature rise.
Remote Sensing SystemsTemperatures are rising in the lower atmosphere and falling in the upper atmosphere.
NOAACO2 levels are rising.
EPAOther greenhouse gas levels are also rising.
Berkeley LabThe carbon in the atmosphere is warming the Earth.
NOAACarbon levels in the ocean are also rising.
EPAWe know humans are emitting a lot of greenhouse gases.
Imperial CollegeA lot of old carbon is being added to the atmosphere indicating that it is lingering from fossil fuel usage.
Skeptical ScienceNice summary of various sources indicating global warming is caused by human activity

Indirect Observations

NOAASea level is rising about one-eight of an inch per year due to thermal expansion and melting land ice.
NASASea level rose ~8 inches between 1870 and 2000.
NASAGreenland and Antarctica are losing ~400 Gigatonnes per year of land ice.
NOAAWe are steadily losing sea ice.
Rutgers UniversitySnow is melting earlier in the spring.
ARCCoral is bleaching from warm temperatures and ocean acidification.
NOAAGlaciers around the world are losing mass.