In this sentence, the infinitive phrase functions as a noun and the subject. It is doing the action, to make. Infinitive phrases can function as nouns, adjectives, and adverbs. Here are examples of each. When an infinitive phrase acts as a noun, it can take the place of any noun in a sentence. That is, it can be the subject, but it can also be the object. Noun Subject Example: To eat ice cream for dessert would be wonderful. In this example, the infinitive phrase functions as subject doing the action of the sentence.
1 Trees Produce Oxygen. 2  Trees Clean the Soil. 3  Trees Control Noise Pollution. 4  Trees Slow Storm Water Runoff. 5  Trees Are Carbon Sinks. 6  Trees Clean the Air. 7  Trees Shade and Cool. 8  Trees Act as Windbreaks. 9  Trees Fight Soil Erosion. 10  Trees Increase Property Values.
As tree sap flows through the sapwood part of the tree, it produces carbon dioxide. This creates positive pressure and if there are any wounds or holes in the sapwood, the sap will ooze out. This is how harvesting saps from trees is achieved; cut or create a hole.