Graph of sunspot numbers from 1960-2018
January 23, 2014

Observations of sunspots and other indicators of solar activity indicate no changes that could have caused global warming over the past half century. 

A single bloom of Mountain avens in an alpine valley
January 23, 2014

Earth has warmed in the past due to changes in the Sun, volcanic eruptions, and naturally occurring increases in greenhouse gases. Our ability to understand and explain past changes is one reason we are confident that recent changes are due to humans. 

Cartoon of a rollercoaster whose hills and descents follow the outline of global surface temperatures over the past 10,000 years
January 23, 2014

Today's global warming is happening at a much faster rate today it did in the warm periods between ice ages over the last million years.

Pattern in coral
January 23, 2014

NOAA is an agency that enriches life through science. From the surface of the sun to the bottom of the ocean, NOAA advances scientific understanding of Earth's environment, climate, and weather.

Passenger rail
January 23, 2014

There is great potential for the collective actions of many individuals worldwide to reduce global warming by making changes in their daily and annual activities that produce heat-trapping gases and aerosols.

Denver International Airport
January 23, 2014

Business leaders can evolve their business models to stay profitable while improving their energy efficiency, reducing their carbon emissions, and reducing their, and their climate-related risks.

Solar grid
January 23, 2014

In principle, we can slow the rate of global warming by slowing the emission rates of heat-trapping gases—mainly carbon dioxide—and black carbon aerosol to the atmosphere. The challenge in slowing or reducing global warming is finding a way to make these changes on a global scale that is technically, economically, socially, and politically viable.

Blossoms
January 23, 2014

Weather and climate occur on different scales of time and space, and depend on different aspects of Earth's environment. Weather describes atmospheric conditions at a particular time and place. Climate is the overall statistical characteristics of weather and environmental conditions, such as long-term averages and ranges of variability, for a given place and season.

Boat moved by Florence storm surge
January 23, 2014

Human-caused climate change is not the sole cause of any single extreme event. However, changes in the intensity or frequency of extremes may be influenced by human-caused climate change.

MSV Nordica
January 23, 2014

Yes, there will probably be some short-term and long-term positive benefits from global warming, but  if a "business as usual" approach to emitting heat-trapping gases is maintained at the present rate, or faster, then the negative costs and impacts of global warming are very likely to far outweigh the positive benefits over the course of this century

Pages