Global warming is caused by both natural factors and human influences that increase greenhouse gases. Natural causes include changes in the sun's intensity and more greenhouse gases trapping heat. Human factors involve burning fossil fuels, industrial production, deforestation and more. Effects of global warming include melting polar ice caps that raise sea levels, stronger hurricanes, spread of diseases and more. To reduce global warming, individuals should adopt sustainable lifestyles like recycling, using less energy and driving less, while governments implement larger solutions.