Generally, global warming is a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants. It is something that give us bad effect. It makes our earth in dangerous condition. This can happen because of some factors, such as human activity and nature. Human activity that can make the effect of global warming increase and also the natural activity that can make it worse.
There some activity of solar energy that can increase temperature of earth. Solar energy has a system which is when solar energy headed to earth, it will reflect by the atmosphere earth. It makes temperature of earth increase when the earth cannot reflect the solar energy from sun, and the solar energy trapped in the earth so it cannot release to the space anymore. Otherwise, temperature will decrease when the amount of solar energy release to space is greater than the energy that trapped in earth, so the earth will become cold.
Natural activity that can make the earth getting warmer is volcanic eruptions. When volcanic eruptions, it will release some matter that make the environment around the volcanic getting warmer. For human activity that can effected the global warming is like dumping waste in to the river. It makes the environment getting worse.
There are some solution that can people do to make the earth better. For the example, turn off the electronic stuff when you are not using it anymore, use water wisely, R3(Reduce, Reuse, and Recycle), etc. We can do a simple things to make our earth getting better and better.