WhiteRav3n gave you a really good answer and I agree with every word of hers.
In addition to this, you can also use nature energies since natural beings always obtain positive and helpful energy you can work with. Elemental magic may be ina a huge association with this as well.
Nature happens to be full of natural energies, working with you energies while including elemental work in this is something that can be done and it will assist you to channel the energies you may find in nature.
There are few examples that I can give for this case. The sun is a very strong embodiment of the fire element, while you can tap into the energy by channeling the energy by different methods that always include energy work. For an instance Sun meditation is a form of meditation that allows a person's body to draw energy from the sun into itself. It typically is practiced in the morning and evening just after the sunrise and before sunset by gazing into the sun and meditating. Although it takes a significant amount of practice to master this type of meditation, anyone can participate as each individual can begin at a low level and work his or her way up to longer and more powerful sessions. The benefits of sun meditation are said to include a balance of emotions and recovery from many physical ailments.
There are different sun meditation techniques that can be done while sitting or standing.
You can do this daily to draw energy from the sun.
Of course that there are many other examples of uses of energy obtained in natural sources, I just gave you a specific one which is fairly clear and understandable. Moon, sun, things related to earth (grouding and centering is very associated to that), are all sources of natural obtained energy. You may channel this energy for your personal use while as everyone stated contrling natural forces is quite impossible...