Final answer:
Methanogens can be found in various environments and are important in climate change due to their production of methane, a greenhouse gas.
Step-by-step explanation:
Methanogens can be found in a variety of environments, including deep-sea hydrothermal vents, high-temperature environments, and the digestive systems of animals. They are important in climate change because they produce methane, which is a greenhouse gas that contributes to global warming. Methanogens play a significant role in the carbon and nitrogen cycles and can have both positive and negative impacts on the environment.