Question

Answer in detail:

Climate change has not always been anthropogenic in nature. Explain.

Answer 1

Though the human activities are a major cause behind climate change, there are some natural causes for climate change. They are as follows: 

Amount of energy output by the sun:

1. Low energy output by the sun can reduce the amount of insolation received by the earth.
2. This can lead to the cooling of the earth.

Milankovitch Oscillation:

1. The earth's rotation around its own axis and revolution around the sun is responsible for the changes in climate.
2. Their changes alter the amount of insolation received from the sun, which in turn might affect its climate.
3. It can cause the earth to be closer to the sun (warmer) and farther from the sun (colder).
4. The ice ages can occur when we are farther from the sun.

Volcanism:

1. Volcanic eruptions throw lots of particulates and aerosols into the atmosphere.
2. These aerosols remain in the atmosphere for a considerable period of time.
3. The winds spread it around the world, thus reducing the sun's radiation reaching the earth's surface.

Goldilocks Zone:

1. The earth lies in the habitable zone called the Goldilocks Zone.
2. Earth experiences a cooler climate when it was located in the outer reaches of this zone.
3. As the size of the sun increases the zone moves outward over time.
4. Such changes in the zone cause earth to warm or cool.