A warming trend refers to an increase in temperature over a period of time. This term is commonly used when describing weather patterns, and it can indicate that temperatures are rising after a period of cooler conditions. A warming trend may be caused by changes in atmospheric pressure or the movement of high-pressure systems, which can bring warm air masses to an area. In the context of climate change, "warming trend" refers to the long-term increase in global temperatures due to human activities such as burning fossil fuels and deforestation.