

Global warming

Global warming

{"id"=>2715, "level_no"=>1, "level_title"=>"New Section", "notes"=>"<strong>global warming</strong>, the phenomenon of increasing average <a class=\"md-crosslink autoxref\" href=\"https://www.britannica.com/science/air\" data-show-preview=\"true\">air</a> <span id=\"ref979216\"></span><a class=\"md-crosslink\" href=\"https://www.britannica.com/science/temperature\" data-show-preview=\"true\">temperatures</a> near the surface of <span id=\"ref979215\"></span><a class=\"md-crosslink\" href=\"https://www.britannica.com/place/Earth\" data-show-preview=\"true\">Earth</a> over the past one to two centuries. Climate scientists have since the mid-20th century gathered detailed observations of various <a class=\"md-crosslink\" href=\"https://www.britannica.com/science/weather\" data-show-preview=\"true\">weather</a> phenomena (such as temperatures, <a class=\"md-crosslink\" href=\"https://www.britannica.com/science/precipitation\" data-show-preview=\"true\">precipitation</a>, and storms) and of related influences on <span id=\"ref837937\"></span><a class=\"md-crosslink\" href=\"https://www.britannica.com/science/climate-meteorology\" data-show-preview=\"true\">climate</a> (such as <a class=\"md-crosslink\" href=\"https://www.britannica.com/science/ocean-current\" data-show-preview=\"true\">ocean currents</a> and the atmosphere’s chemical composition). These data indicate that Earth’s climate has changed over almost every conceivable timescale since the beginning of geologic time and that <a class=\"md-crosslink\" href=\"https://www.britannica.com/topic/human-being\" data-show-preview=\"true\">human</a> activities since at least the beginning of the <a class=\"md-crosslink\" href=\"https://www.britannica.com/event/Industrial-Revolution\" data-show-preview=\"true\">Industrial Revolution</a> have a growing influence over the pace and extent of present-day <span id=\"ref979213\"></span><a class=\"md-crosslink\" href=\"https://www.britannica.com/science/climate-change\" data-show-preview=\"true\">climate change</a>.", "challenge_id"=>2197, "created_at"=>Mon, 15 May 2023 09:15:01 UTC +00:00, "updated_at"=>Mon, 15 May 2023 09:15:01 UTC +00:00}
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Section 1

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global warming, the phenomenon of increasing average air temperatures near the surface of Earth over the past one to two centuries. Climate scientists have since the mid-20th century gathered detailed observations of various weather phenomena (such as temperatures, precipitation, and storms) and of related influences on climate (such as ocean currents and the atmosphere’s chemical composition). These data indicate that Earth’s climate has changed over almost every conceivable timescale since the beginning of geologic time and that human activities since at least the beginning of the Industrial Revolution have a growing influence over the pace and extent of present-day climate change.