Climate change is a complex phenomenon with many aspects, including:
* Temperature changes: These are measured by thermometers, satellites, and other instruments.
* Sea level rise: This is measured by tide gauges and satellite altimeters.
* Changes in precipitation patterns: This is measured by rain gauges and weather radar.
* Changes in ocean acidity: This is measured by sensors deployed in the ocean.
* Changes in ice cover: This is measured by satellites and ground-based instruments.
Therefore, climate change is measured by a combination of different instruments that monitor various aspects of the climate system.
