 Environmental issues are problems with water, land, and air. They are usually caused by people. There are more than 7 billion people on Earth. The estimate for the year 2050 is 8 to 10 billion people. People need food, clean water, fuel, and other natural resources to live. One environmental issue is waste. If there are more people, there will be more waste. If there are more people, we will use more energy. Cars need fuel. New buildings and houses need electricity. When people and businesses use chemicals, the chemicals go into the land, air, and water. This causes pollution. Pollution can kill animals and make people very sick. Also, the weather is changing. Some places are getting hotter, others are getting colder. There are more and bigger storms. We have to ask, do we have enough natural resources for 8 to 10 billion people? The end.