Answer:
The long-term increase in the temperature of the planet Earth due to certain reasons such as human activities is termed as global warming. Global warming is a concern for scientists nowadays as its consequences are very harmful to life on Earth.
Global warming causes climate changes due to which survival in extreme heat conditions will become very difficult in the near future. The greenhouse gases will cause life on Earth to be dangerous as these gases when increase than normal will be toxic. The greenhouse gases are causing the ozone layer to get depleted without which life on Earth will not be possible.