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How are humans responsible for global warming? | Environmental ...

www.edf.org/climate/human-activity-is-causing-global-warming

6 days ago ... Causes of global warming include human activities like deforestation and burning fossil fuels.

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 ...

Global Warming is Human Caused - National Wildlife Federation

www.nwf.org/Wildlife/Threats-to-Wildlife/Global-Warming/Global-Warming-is-Human-Caused.aspx

Scientists have concluded that most of the observed warming is very likely due to the ... Human activity--such as burning fossil fuels--causes more greenhouse ...

Climate Change: Vital Signs of the Planet: Causes

climate.nasa.gov/causes

Vital Signs of the Planet: Global Climate Change and Global Warming. What is the ... On Earth, human activities are changing the natural greenhouse. Over the ...

Causes of Global Warming: the Human Impact

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

Evidence That Humans are Causing Global Warming ... This is largely due to human activities; primarily the burning of fossil fuels, but also due to deforestation  ...

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/

They say the theory of human-caused global climate change is based on questionable ... says human activity is primarily responsible for global climate change.

Science | Climate Change | US EPA

www3.epa.gov/climatechange/science/overview.html

Natural causes alone cannot explain all of these changes. Human activities are contributing to climate change, primarily by releasing billions of tons of carbon ...

Human Caused Global Warming — OSS Foundation

ossfoundation.us/projects/environment/global-warming/human-caused

How do we know current global warming is human caused, or man made? Is global ... How do we know that recent CO2 increases are due to human activities ?

Empirical evidence that humans are causing global warming

www.skepticalscience.com/empirical-evidence-for-global-warming.htm

Direct observations find that CO2 is rising sharply due to human activity. ... a line of empirical evidence that human CO2 emissions are causing global warming.

Answers
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.