Overpopulation in South Korea means that there are too many people living in cities, which can lead to crowded living spaces, traffic congestion, and long waiting times for public transportation. Global warming refers to the Earth getting warmer because of the increase in greenhouse gases, like carbon dioxide, which is caused by burning fossil fuels for electricity and transportation. Pollution in South Korea happens when harmful substances, like chemicals and waste, are released into the air and water, making it unsafe for humans and wildlife.
