Global warming

Present-day climate change includes both global warming—the ongoing increase in global average temperature—and its wider effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to Earth's climate. The modern-day rise in global temperatures is driven by human activities, especially fossil fuel burning since the Industrial Revolution.

Fossil fuel use, deforestation, and some agricultural and industrial practices release greenhouse gases.
These gases absorb some of the heat that the Earth radiates after it warms from sunlight, warming the lower atmosphere.
Earth's atmosphere now has roughly 50% more carbon dioxide, the main gas driving global warming, than it did at the end of the pre-industrial era, reaching levels not seen for millions of years.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0