1. Climate change is the significant variation of average weather conditions becoming, for example, warmer, wetter, or drier—over several decades or longer. (https://climateknowledgeportal.worldbank.org/overview#:~:text=Climate%20change%20is%20the%20significant,change%20from%20natural%20weather%20variability.)
2. Climate change refers to long-term shifts in temperatures and weather patterns, mainly caused by human activities, especially the burning of fossil fuels. (https://www.un.org/en/climatechange/what-is-climate-change)
3. Climate change is the global phenomenon of climate transformation characterized by the changes in the usual climate of the planet (regarding temperature, precipitation, and wind) that are especially caused by human activities. (https://youmatter.world/en/definition/climate-change-meaning-definition-causes-and-consequences/)
4. Climate change refers to significant changes in global temperature, precipitation, wind patterns, and other measures of climate that occur over several decades or longer.(https://www.ucdavis.edu/climate/definitions )
5. Climate change is a long-term change in the average weather patterns that have come to define Earth's local, regional, and global climates. ( https://climate.nasa.gov/what-is-climate-change/ )
CLIMATE: the long-term weather pattern in a region, typically averaged over 30 years. More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years.
In simple terms, it is the weather conditions prevailing in an area in general or over a long period.