The document discusses global warming and its causes and effects. It states that in the 20th century, the average surface temperature of the planet increased by 0.74°C and carbon dioxide levels in the atmosphere are currently 383 parts per million, up from 280 parts per million previously. Some of the factors contributing to global warming include increased emissions from cars, airplanes, industry, and human activity in general. Potential effects of global warming mentioned include rising sea levels, changes in rainfall patterns, increased extreme weather events like hurricanes, and threats to animal habitats and ecosystems. The document calls for reducing emissions and reliance on fossil fuels to help mitigate the impacts of global warming.