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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.

Global warming - Wikipedia

en.wikipedia.org/wiki/Global_warming

Global warming and climate change are terms for the observed century-scale rise in the average temperature of the Earth's climate system and its related effects.

Global Warming Facts, Definition, Causes and Effects | NRDC

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 ...

What Is Global Warming? | Global Warming Facts - Live Science

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 ...

What Is Global Warming? - National Geographic

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

Jan 13, 2017 ... 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 ...

What is global warming? | What's Your Impact

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.

Climate change evidence: How do we know?

climate.nasa.gov/evidence/

Vital Signs of the Planet: Global Climate Change and Global Warming. ... There is no question that increased levels of greenhouse gases must cause the Earth ... All three major global surface temperature reconstructions show that Earth has ...

Global warming hiatus - Wikipedia

en.wikipedia.org/wiki/Global_warming_hiatus

The instrumental temperature record does not cover the entire globe: there are areas of ...

Is There Global Warming? The answer may not be what you ...

www.isthereglobalwarming.com/

Global temperatures increased for twenty years from the late 1970s to the late 1990s but have either ... There has been no global warming for 18 years, 8 months link ... *Scientists predict low solar activity to 2014 will cause global cooling. link.