Global warming is already affecting the planet according to documented changes in weather patterns and temperatures. Temperatures have risen 1.5 degrees F since 1900 with the last 10 years being the warmest on record. Sea levels are rising as ocean water expands and land ice melts, and sea ice is declining rapidly. Precipitation patterns are also changing, with some areas experiencing more or less rain and everywhere seeing more extreme rainfall events. The author argues that addressing global warming is a moral issue that current generations must confront to protect future ones.