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There is strong evidence that human activity is a major cause of global warming.
In a study, models based on man-made emissions of greenhouse gases matched the real world observations almost precisely.

Causes of Global Warming: the Human Impact

globalwarming-facts.info/causes-global-warming-human/

Anthropogenic emissions contribute substantially to global warming. ... This is largely due to human activities; primarily the burning of fossil fuels, but also due to ...

Global Warming is Human Caused - National Wildlife Federation

www.nwf.org/wildlife/threats-to-wildlife/global-warming/global-warming-is-human-caused.aspx

Illustration of how global warming works. Human activity--such as burning fossil fuels--causes more greenhouse gases to build up in the atmosphere. As the ...

What sparked global warming? People did. | Environmental Defense ...

www.edf.org/climate/what-sparked-global-warming-people-did

Carbon dioxide has caused most of the warming, science tells us. We can ... Scientists are more confident than ever that humans are causing global warming.

Causes Why is climate change happening? - Climate Change: Vital ...

climate.nasa.gov/causes

Vital Signs of the Planet: Global Climate Change and Global Warming. What is ... and other human activities has increased concentrations of greenhouse gases.

Do We Know that Humans Are the Major Cause of Global Warming

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

How Do We Know that Humans Are the Major Cause of Global Warming? ... that emissions of heat-trapping gases from human activities have caused “most of ...

Is Human Activity Primarily Responsible for Global Climate Change ...

climatechange.procon.org/view.answers.php?questionID=001445

Apr 7, 2015 ... "Multiple lines of independent evidence confirm that human activities are the primary cause of the global warming of the past 50 years.

Climate Change ProCon.org

climatechange.procon.org/

Is Human Activity Primarily Responsible for Global Climate Change? .... Global warming caused by human-produced greenhouse gases is causing the Arctic ice  ...

The facts don't add up for human-caused global warming ...

www.post-gazette.com/opinion/jack-kelly/2014/05/29/The-facts-don-t-add-up-for-human-caused-global-warming/stories/201405290275

May 29, 2014 ... The facts don't add up for human-caused global warming ... “Do you think human activity is a significant contributing factor in changing mean ...

Human Global Warming: What Are the Main Causes? | PlanetSave

planetsave.com/2009/04/18/human-global-warming-what-are-the-main-causes/

Apr 18, 2009 ... To understand how humans cause global warming, it is important that you are aware of the link between your daily activities and the ...