Global warming is the term used to describe a gradual increase in the average temperature of the Earth’s atmosphere and its oceans, a change that is believed to be permanently changing the Earth’s climate.Several current trends clearly demonstrate that global warming is directly impacting on rising sea levels, the melting of ice caps and significant worldwide climate changes Even though it is an ongoing debate, it is proved by the scientists that the planet is warming.

Topic Sentence 1- causes
Scientists have spent decades figuring out what is causing global warming. They've looked at the natural cycles and events that are known to influence climate. But the amount and pattern of warming that's been measured can't be explained by these factors alone.One of the first things scientists learned is that there are several greenhouse gases responsible for warming, and humans enfluence them in a variety of ways.Different greenhouse gases have very different heat-trapping abilities and certain gases in the atmosphere block heat from escaping which doesnt allow heat to reflect back in the space causing temperature to rise. Most come from the consumption of fossil fuels in cars, factories and electricity production. The gas responsible for the most warming is carbon dioxide (Facts of Carbondioxide as years pass and example from movie). Other contributors include methane released from landfills and agriculture (especially from the digestive systems of grazing animals), nitrous oxide from fertilizers, gases used for refrigeration and industrial processes, and the loss of forests that would otherwise store CO2.

Topic Sentence 2- Effects - Changes in Wheater pattern
Rising Temperature due to global warming could lead to increased droughts and wildfires, heavier rainfall and a greater number of Category 4 and 5 hurricanes.Warmer water in the oceans pumps more energy into