Global warming means more warm extreme weather conditions, according to an analysis of more than 140 years of air temperature data.
The climate is changing. The Earth is becoming warmer and man-made emissions of greenhouse gases in the atmosphere are the predominant reason why. The theory of how greenhouse gases warm the atmosphere has been the subject of deep and profound scientific discussions. The theory has been challenged and tested, and it has not been possible to reject it given a profound lack of compelling evidence to the contrary. Understanding temperature variations is a prerequisite for understanding patterns of global and regional climate change. Variations in observed temperature around the world and through time allow us to map these areas where we have trustworthy and systematic temperature measurements. Understanding this allows us to assess the conditions for the future, and make projections of variations and extremes in both warm and cold weather.