The document discusses global warming caused by fossil fuels like coal, oil, and natural gas. It notes that coal is used for heating, electricity, steel production, and cement manufacturing, but that it releases carbon dioxide, causes health problems, and releases toxic mercury. It proposes increasing solar power as a solution, as solar power has advantages of lower prices, zero pollution, and safety, though it requires large areas for installation and depends on sunlight. The document concludes by noting impacts of fossil fuels like increased CO2 levels, damage to the ozone layer, urban heat islands, and lifestyle changes, and poses questions on the topic.