Global warming - Wikipedia
Global warming is the observed century-scale rise in the average temperature of the Earth's climate system and its related effects, as part of climate change. Multiple lines of scientific evidence show that the climate system is warming. ...
Global warming - Britannica.com
Modern global warming is the result of an increase in magnitude of the so-called greenhouse effect, a warming of Earth?s surface and lower atmosphere caused by the presence of water vapour, carbon dioxide, methane, nitrous oxides, and other greenhouse gases.
Global Warming | Union of Concerned Scientists
Global warming is happening now. The planet's temperature is rising. The trend is clear and unmistakable. Every one of the past 40 years has been warmer than the 20th century average. 2016 was the hottest year on record.
Global Warming 101 - Definition, Facts, Causes and Effects ...
A: Global warming occurs when carbon dioxide (CO2) and other air pollutants and greenhouse gases collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth ...
NASA Climate - Official Site
NASA?s Global Climate Change website hosts an extensive collection of global warming resources for media, educators, weathercasters and public speakers. Browse by topic and by media type, including videos, social media shareables, infographics, quizzes and interactives.