At its core, climate change simply indicates "any significant change in the measures of climate lasting for an extended period of time" (EPA, pre-2017). Global climate change is often spoken of in tandem with global warming, which refers to the recent warming trends in the average temperature of the Earth.
From Duke University 20 Facts for Climate Deniers
From US Environmental Protection Agency 'Climate Change Indicators in the United States'.
Skeptical Science: Global Warming & Climate Change Myths
Much like the glass of a greenhouse, the Earth's atmosphere keeps heat contained to a level that allows life to flourish. The atmosphere consists of water vapor, nitrogen, oxygen, and trace gases, which include carbon dioxide, methane, and nitrous oxide. The general warming of the planet is being caused by an increase in these trace gases, often called 'greenhouse gases', which then trap increasing amounts of heat. Less of the infrared heat that is emitted by the Earth is able to pass through the atmosphere when these gases are increased, and instead reflect back, warming the Earth's surface more than usual.
Greenhouse gases are emitted during the burning of fossil fuels (like coal, oil and natural gas). The Environmental Protection Agency has an interactive map showing the facilities that emit a large amount of greenhouse gases.
The changing climate is interfering with natural cycles, causing extreme weather events, rising sea levels1 as glaciers and ice caps melt, and threatening many species with extinction as their environment changes and the oceans become increasingly acidic.
Last updated March 30, 2023