The document discusses greenhouse gases, climate change, and global warming. It defines each term and explains how they are related. The primary cause of global warming is believed to be the expansion of the greenhouse effect caused by human activity. Potential consequences of unchecked global warming include changing weather patterns, health impacts, effects on wildlife like polar bears becoming extinct, and rising sea levels endangering coastal areas and glaciers. Individual actions like recycling and using less energy can help reduce global warming, while some argue the effects may be minor or the problem does not exist. The document expresses the opinion that global warming does exist and preemptive action is warranted.