caused by or related to human action
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caused by or related to human action
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"The global warming of the past 50 years is primarily due to human activities, predominantly the burning of fossil fuels."
"Climate has changed naturally throughout Earth’s history. However, natural factors cannot explain the recent observed warming."
"In the past, climate change was driven exclusively by natural factors: explosive volcanic eruptions that injected reflective particles into the upper atmosphere, changes in energy from the sun, periodic variations in the Earth’s orbit, natural cycles that transfer heat between the ocean and the atmosphere, and slowly changing natural variations in heat-trapping gases in the atmosphere.
"All of these natural factors, and their interactions with each other, have altered global average temperature over periods ranging from months to thousands of years. For example, past glacial periods were initiated by shifts in the Earth’s orbit, and then amplified by resulting decreases in atmospheric levels of carbon dioxide and subsequently by greater reflection of the sun’s energy by ice and snow as the Earth’s climate system responded to a cooler climate
Global warming
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