Global warming is that the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) thanks to human activities, primarily fuel burning, which increases heat-trapping greenhouse emission levels in Earth's atmosphere. heating is that the unusually rapid increase in Earth's average surface temperature over the past century primarily thanks to the greenhouse gases released as people burn fossil fuels. heating is a facet of global climate change, pertaining to the long-term rise of the planet's temperatures. it's caused by increased concentrations of greenhouse gases within the atmosphere, mainly from human activities like burning fossil fuels, deforestation and farming. heating. The thicker layer of greenhouse gases traps more heat. This end in a rise in average temperature of the world and therefore the earth becomes hotter and warmer. this is often called heating. If we don't take steps to scale back heating, it'll cause loss of human lives, plants and animals.