It is a constant, long-term increase of average temperature across Earth. Global warming is one of the main issues of climate change.
We can see global warming development by looking at temperature records. Scientists have such data dating the 1890s up to present dates. By comparing climate state at different time periods, there is a clear trend of a rise in global average temperature.
In fact, recently WMO recognized 2009-2019 as the hottest decade in terms of temperatures on records.
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