You had better provide us with the full prompt of the essay. Also, you have to revise your grammar carefully to have the best preparation for your actual test. I can see many grammatical mistakes in your essay :(
increasing population required many energy sources to meet what they need
It is true that population growth has put immense pressure on natural resources
governmental efforts should be drive to make a balance between the environment and the humankind
You could start a new sentence from here and this could be used as your thesis statement
-> In my opinion, while using alternative sources of energy will be a good solution, this measure can bring some disadvantages.
many issue
many issues
burning of energy generation
the strain on available natural resources