climate change

Climate change is a change in the weather over periods of time that range from decades to millions of years. It can be a change in the average weather or a change in the distribution of weather events around an average. Climate change maybe limited to each specific region, or may happen over the whold Earth.
Factors that cause climate change include such processes as variations in solar radiation, deviations in the Earth's orbit, mountain-building and continental drift, and changes in greenhouse gas concentrations. Some parts of the climate system, such as the oceans and ice caps, respond slowly in reaction to climate forcing because of their large mass. Therefore, the climate system can take centuries or longer to fully respond to new external forcings.
Evidence for climatic change is taken from a variety of sources that can be used to reconstruct past climates. The complete global records of surface temperature are available beginning from the mid-late 1800s. For earlier periods, most of the evidence is indirect.

This picture shows climate change. It is because the smoke coming out from the factories are polluting the air and will cause air pollution which will lead to climate change. In Singapore, there are also quite a number of factories like this. Although the factories are built quite far away from the city area, the smoke will still travel from that place to the rest of Singapore. That will cause sudden weather change in Singapore, like it will suddenly rain during a sunny day, and there is sun when it is raining. Other than the air pollution from the factories, people also pollute the Earth by land and water pollution which will also cause climate change in the whole world.