For decades humans are dependent on petroleum products. Nowadays, Governments are promoting alternative energy sources like wind energy and solar energy. In my opinion, this is a positive development because these sources are eco-friendly and cost-effective. One of the main reasons that policymakers are encouraging people to shift to alternative sources is that they are eco-friendly. This is because they are not impacting our environment. Wind or solar energy is also called green energy due to the fact that they are environment friendly. For instance, Recent study showed that countries which shift to alternative sources of energy have seen 28% of better atmosphere in their country, resulting in more countries following same path. The more we rely on these sources, the more beneficial for our planet earth. Another positive development for shifting to these energy sources is that they are cost-effective. This is because less expenses are required to install air mills or sola...