Which human action would help reduce global warming? (1 point)

a. ride a bicycle rather than walk to school.
b. use more fertilizers to increase crop production.
c. eat less red meat so fewer cattle need to be raised.
d. clear more forests to produce more farmland

c. eat less red meat so fewer cattle need to be raised.

The human action that would help reduce global warming is:

c. eat less red meat so fewer cattle need to be raised.

The human action that would help reduce global warming is option C: eat less red meat so fewer cattle need to be raised.

Explanation:
To determine the answer, we need to understand the impact of each action on global warming.

Option A, riding a bicycle rather than walking to school, can have a positive impact on reducing greenhouse gas emissions. Bicycles do not emit any greenhouse gases compared to motor vehicles. However, the impact of this action might be limited on a global scale unless it is widely adopted.

Option B, using more fertilizers to increase crop production, can actually contribute to global warming. Fertilizer production and use release significant amounts of nitrous oxide, a potent greenhouse gas. Therefore, this action would have a negative impact on reducing global warming.

Option C, eating less red meat so fewer cattle need to be raised, is a significant step towards reducing global warming. Cattle farming is a major contributor to greenhouse gas emissions, mainly through methane production. Methane is a potent greenhouse gas and reducing the number of cattle raised can help in reducing those emissions.

Option D, clearing more forests to produce more farmland, would have a detrimental effect on global warming. Forests play a crucial role in absorbing carbon dioxide - a major greenhouse gas. Clearing more forests would release the stored carbon into the atmosphere and increase greenhouse gas concentrations, exacerbating global warming.

In summary, among the given options, option C, eating less red meat to reduce the number of cattle raised, would help in reducing global warming.