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global warming evidence

Hottest Month On Record Portends Global Warming Speed Up

August 25, 2015 by Joseph Romm

Monthly Temps and Global Warming Risk

Last month was not just the hottest July on record. Since July is “the warmest month of the year globally,” NOAA’s latest monthly State of the Climate Report, notes that July 2015 “was also the highest among all 1627 months in the record that began in January 1880.”[read more]

Warmest Winter on Record

March 28, 2015 by Tom Schueneman

Seasonal Temperature Records

According to the latest report from the National Oceanic and Atmospheric Administration (NOAA), the average global land and sea surface temperature for the period of December 2014 through February 2015 was 1.42 degrees Fahrenheit (0.79 Celsius) above the 20th century average.[read more]

Why Care about Global Warming? Droughts, Poor Harvests, and Social Upheaval

March 11, 2015 by Henry Auer

Global Warming, Global Risk

In both industrialized countries and developing countries there may be those who ask “why should we care about global warming?” After all, many people may not feel that they are affected by warming, and may pay scant attention to reports showing the effects of extreme weather and climate events.[read more]

Energy Quote of the Day: GOP Should be Mortified by the Face of their Environmental Leadership

March 7, 2015 by Jared Anderson

Climate and Politics

The Washington Post editorial board penned a scathing op-ed in response to Oklahoma Senator Jim Inhofe’s stunt on the Senate floor last week. Inhofe brought in a snowball from outside to make the point that it was cold in Washington D.C., and thus climate change was a farce.[read more]

Was 2014 Really the Warmest Year?

January 22, 2015 by Geoffrey Styles

Warming Records and Data Analysis


Measured temperatures have warmed nearly 2° Fahrenheit since the early 20th century. Whether last year or 2010 was warmer might seem like more of an academic point than a practical one. However, the refrain of "record temperature" reports creates a false impression that the warming is accelerating.[read more]

Answers to 3 Key Questions About the Hottest Year on Record

January 19, 2015 by Joe Casola

Yearly Temperature Records

Last year was the warmest year globally in the 135 years since records have been kept. This finding was recently confirmed by both the National Oceanic and Atmospheric Administration and the National Aeronautics and Space Administration.[read more]


Communicating About Climate Change: 'The Elephant We're All Inside Of'

January 12, 2015 by Jim Pierobon

Climate Change and Communication

How stakeholders communicate about climate change has long been framed by who’s doing the framing more than the information being communicated. I'm curious how various stakeholders – believers, skeptics and deniers alike – are talking about it and who, if anybody, is ‘moving the needle’ in either direction.[read more]

Australian Climate Heating for 2014

January 8, 2015 by Barry Brook

Temps and Climate in Australia

The Bureau of Meteorology in Australia has released its annual climate statement, for 2014, and it was again a hot year across the continent. There is a lot of year-to-year variation driven by natural climate variability, but the running mean (10-year average) plots a relatively steady rise over the last 60+ years.[read more]

Deniers Mistakenly Say that Global Warming Has Ended

October 20, 2014 by Henry Auer

Climate Denial and Global Warming

The global average temperature has increased by about 0.7-0.8ºC over pre-industrial temps. A pause of annual global temperatures began after 1997 even though the atmospheric concentration of CO2 continued to increase. Global warming deniers have seized on this to say that warming of the Earth has ended.[read more]

Earth Is Heating Faster Than We Realized, Making 2°C Limit For Global Warming More Urgent

October 8, 2014 by Joseph Romm

Earth Heating Up Faster

A major new study finds that “scientists may have hugely underestimated the extent of global warming because temperature readings from southern hemisphere seas were inaccurate.” In short, as New Scientist puts it, “it’s worse than we thought.”[read more]

NOAA State Of The Climate In 2013: 'Our Planet Is Becoming A Warmer Place'

July 21, 2014 by Joseph Romm

A Warming Planet

The planet has continued to warm at an unhealthy pace over the last year, according to a report combining the efforts of hundreds of the world’s top scientists led by researchers at the National Oceanic and Atmospheric Administration.[read more]

Hottest Spring On Record Globally, Reports Japan Meteorological Agency

June 21, 2014 by Joseph Romm

Hottest Spring Ever

The Japan Meteorological Agency (JMA) reported Monday that March-May was the hottest in more than 120 years of record-keeping. It was also the hottest May on record. This is especially noteworthy because we’re still waiting for the start of El Niño.[read more]