The long-term regional or even worldwide average of temperature, humidity, and rainfall patterns throughout seasons, years, or decades is referred to as climate. Global warming is the long-term warming of Earth's climate system that has been seen from the pre-industrial period (between 1850 and 1900) as a result of human activity, principally fossil fuel combustion, which increases heat-trapping greenhouse gas levels in the atmosphere. The terms are sometimes used interchangeably, while the latter refers to both human- and naturally-caused warming, as well as the consequences for our world. The average increase in Earth's global surface temperature is the most frequent measure. A long-term change in the average weather patterns that have come to define Earth's local, regional, and global climates is referred to as climate change. These modifications have a wide range of impacts that are synonymous with the term. Human activities, notably fossil fuel burning, have increased heat-trapping greenhouse gas levels in Earth's atmosphere, elevating Earth's average surface temperature, as seen in changes in the climate from the early twentieth century. Global warming is the term used to describe the temperature rises caused by humans.