The two biggest energy issues currently faced by humans, from the options provided, are: rapid fuel use and pollution resulting from fuel use. Both of them are caused because the model of energy supply we have nowadays is totally dependent on fossil fuels that, as we know, is a limited resource, non-renewable. The consequences that this model brings is shortage of this resource as well as pollution and climate change, provoking increase in temperature, greenhouse gases, heat waves, rise in sea level and decrease in rainfall.