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Global Warming refers to an average increase in the Earth's temperature, which in turn causes changes in climate.
When scientists talk about the issue of climate change, their concern is about global warming caused by human activities.

en.wikipedia.org/wiki/Global_warming

Global warming, also referred to as climate change, is the observed century- scale rise in the average temperature of the Earth's climate system and its related  ...

www.nrdc.org/stories/global-warming-101

Mar 11, 2016 ... A: Here's a simple definition of global warming. (And yes, it's really happening.) Over the past 50 years, the average global temperature has ...

www.nationalgeographic.com/environment/global-warming/global-warming-overview

We call the result global warming, but it is causing a set of changes to the Earth's climate, or long-term weather patterns, that varies from place to place. As the ...

www.livescience.com/37003-global-warming.html

Dec 15, 2014 ... Global warming is the gradual heating of Earth's surface, oceans and atmosphere. Scientists have documented the rise in average ...

www.nmsea.org/Curriculum/Primer/Global_Warming/fossil_fuels_and_global_warming.htm

Global Warming is the increase of Earth's average surface temperature due to effect of greenhouse gases, such as carbon dioxide emissions from burning fossil  ...

whatsyourimpact.org/global-warming

Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Global warming is caused by the ...

earthobservatory.nasa.gov/Features/GlobalWarming/page2.php

Global warming is happening now, and scientists are confident that greenhouse gases are responsible. To understand what this means for humanity, it is ...

climate.nasa.gov/evidence

Vital Signs of the Planet: Global Climate Change and Global Warming. How do we know it's happening? Here's the evidence.

timeforchange.org/definition-for-global-warming-what-is-global-warming

The question about the definition for global warming or in other words "what is global warming" is relatively easy to answer. We hereby lean at the definitions ...