The document discusses climate change, global warming, and the greenhouse effect. It explains that climate change occurs due to global warming, which happens as a result of the greenhouse effect trapping heat. The greenhouse effect is caused by an increase in heat-trapping gases like methane and CO2 released by human activities. If unchecked, global warming could lead to rising sea levels from melting ice, stronger hurricanes, droughts and floods, and threats to species and economies. While some argue natural factors are responsible, the document asserts that human greenhouse gas emissions are the primary cause of current global warming trends.