Global warming is an increase in the earth's atmospheric and oceanic temperatures widely predicted to occur due to an increase in the greenhouse effect resulting especially from pollution. Global warming causes: One of the biggest causes for global warming is the greenhouse gases emitted by humans. Scientists have searching for years for the answers behind global warming and it keeps coming back to greenhouse gases. Greenhouse gases consist of several different things mainly produced by humans. They come from cars, electricity, and factories. Carbon dioxide is the biggest culprit behind global warming. The scientists responsible for researching global warming are a part of the intergovernmental panel on climate change (IpcC). This group of scientists meet every few years to discuss/report any new findings.