What are some environmental concerns about the world?

People are worried about the rise in the level of greenhouse gases in the atmosphere, which results in global warming. Global warming causes the rise in Earth's temperature. This will in turn melt the ice caps and cause a rise in sea level. Many low-lying cities will be flooded and small islands submerged in water. Ecology is also affected as the arctic life will experience a smaller habitat and a lack of food. Rise in temperatures will also cause them to die of heat.