<human>:  What are the top causes for global warming?
<bot>: 
1. Burning of fossil fuels, resulting in the release of carbon dioxide into the atmosphere.
2. Deforestation, reducing the number of trees that would otherwise absorb carbon dioxide.
3. Agricultural activities, such as livestock farming and the use of synthetic fertilizers, which release greenhouse gases like methane, nitrous oxide, and carbon dioxide.
4. Industrial activities, such as burning fossil fuels, which release harmful contaminants into the atmosphere.
5. Increased use of chemicals and other pollutants, which can have a long-term effect on the environment.
6. Natural phenomena, such as volcanic eruptions and shifts in the Earth's orbit, can also contribute to climate change.