"Renewable energy comes either directly or indirectly from the sun." What does the writer want to mean by the sentence? Explain in 2/3 sentences.

Mr. APJ Abdul Kalam is an Internationally acknowledged scientist and a former president of India.

Science Congress is an organisation where scientists expose their research activities on science and technology.

Leading Industrial countries have taken initiatives to tap alternative energy sources mainly green or renewable energy sources to meet the future energy challenges of the world.

The Scientist Kalam is concerned about mankind's future energy crisis.

The potential danger of nuclear energy means the alarming situation resulting from frequent use of nuclear energy!

Mr. Kafam puts so much importance to the issue of energy as the energy sources have always been a major factor of change throught history.