The document discusses global warming and climate change. It notes that the average global temperature has risen 0.6°C in the 20th century. Greenhouse gas emissions from human activities like burning fossil fuels are trapping heat in the atmosphere and contributing to rising temperatures. If temperatures continue to increase, severe impacts are predicted like more extreme weather, rising sea levels, and parts of the world becoming uninhabitable. Reducing greenhouse gas emissions through green practices in businesses and communities can help mitigate these effects while providing economic and health benefits.