Global warming is defined as the increase in average surface temperatures worldwide due to increased greenhouse gas emissions since the mid-20th century. Some of the warmest years on record have been 2005, 1998, 2002, 2003, and 2004. Polar bears, sea turtles, North Atlantic right whales, giant pandas, orangutans, and elephants are some species that are endangered by global warming. Simple actions like replacing light bulbs with CFLs, driving less, keeping tires properly inflated, installing low-flow showerheads, turning electronics off when not in use, and planting trees can all help reduce greenhouse gas emissions and slow global warming. Global warming is a real phenomenon and is not a hoax.