Many commercial greenhouses use heaters that burn gas or oil because?

It promotes the movement of air as heat circulates and rises, helping to reduce excess humidity that could harm crops. This efficient system can not only reduce fuel costs by up to 10%, but it warms the medium and root zone before rising to heat the crops and the air above, creating ideal growing conditions.

The heating of a greenhouse is traditionally done by using a central gas boiler which heats water that is distributed into the greenhouse. ... These hot air heaters run on either natural gas, petroleum and diesel. This direct combustion generates the by-product carbon dioxide, which can be advantageous for plant growth.

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the answer is :