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en.wikipedia.org/wiki/Global_warming

Main article: Attribution of recent climate change. By itself, the climate system ...

climate.nasa.gov/causes

Most climate scientists agree the main cause of the current global warming trend is human expansion of the "greenhouse effect" — warming that results when ...

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

Mar 11, 2016 ... Everything you wanted to know about our changing climate but were too afraid to ask.

www.edf.org/climate/9-ways-we-know-humans-triggered-climate-change

Humans are the main cause. ... In fact, we are statistically more confident that humans cause climate change than that smoking causes cancer. ... combined, point to human activities as the only explanation of rising global temperatures since ...

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

Human influence is rapidly changing the climate. ... Each report represents a consensus, or agreement, among hundreds of leading ... Causes and Effects of Climate Change What causes climate change (also known as global warming)? And ...

www.ucsusa.org/global_warming/science_and_impacts/science/human-contribution-to-gw-faq.html

Unprecedented warming. Earth's surface has undergone unprecedented warming over the last century, and especially in this century. Every single year since ...

ec.europa.eu/clima/change/causes_en

Methane is responsible for 17% of man-made global warming, nitrous oxide for ... almost certainly the main cause of the warming observed since the middle of ...

19january2017snapshot.epa.gov/climate-change-science/causes-climate-change

Dec 27, 2016 ... These factors have caused Earth's climate to change many times. .... The main greenhouse gases .... see the Greenhouse Gas Emissions website, including an expanded discussion of global warming potentials and how they ...

www.c2es.org/docUploads/PewSB1-Attribution-SMALL_102606.pdf

human activities are the main cause of contemporary global warming. Recent decades have seen record-high average global surface temperatures.