The correct answer is B. Geothermal energy.
Geothermal energy is a renewable energy source that comes from the heat within the Earth. It is a clean and sustainable source of energy that does not produce greenhouse gases. Geothermal energy can be used to generate electricity, heat homes and businesses, and provide hot water.
Coal is a fossil fuel that is formed from the remains of ancient plants and animals. When coal is burned, it releases carbon dioxide into the atmosphere, which contributes to climate change.
Natural gas is a fossil fuel that is formed from the remains of ancient plants and animals. When natural gas is burned, it releases less carbon dioxide into the atmosphere than coal does. However, natural gas is still a fossil fuel and its combustion contributes to climate change.
Petroleum is a fossil fuel that is formed from the remains of ancient plants and animals. When petroleum is burned, it releases the most carbon dioxide into the atmosphere of any of the fossil fuels. Petroleum is also a non-renewable resource, which means that it will eventually run out.
In conclusion, geothermal energy is the source of energy that causes the least global warming. It is a clean, sustainable, and renewable source of energy that does not produce greenhouse gases.