The paper emphasizes the importance of Nikola Tesla's research and views of the Universe, man and humanity for modern world environmental issues. In the context of such an approach, the paper gives an overview of Tesla's understanding of energy as the basic substrate of the Universe and life, the source of which is the Sun's rays. While pointing out the main sources of energy, Tesla also reminded us of their limited quantity and the possibility of creating unlimited sources of energy, the use of which would not endanger the existence of man and civilization. Accordingly, the author stresses Tesla's contribution to creation by converting thermal into electric energy its long-distance transfer and his studies of the Universe and teleautomatics.