Renewable energy is power generated from sources that are adequately replenished. It includes solar energy, wind energy, hydroelectric, tides, biomass, and geothermal heat. Some sources also consider hydrogen and fuel cells as a form of renewable energy.

Renewable energy should not be confused with alternative energy. The difference is that alternative energy specifically avoids fossil fuels such as oil, natural gas, and coal. It doesn’t harm the environment or add greenhouse gases that add to global warming. For example, wood burning is not alternative energy because it leads to deforestation and adds greenhouse gases. But it is a source of biomass renewable energy in that new trees can be grown.

Hydroelectric power is both renewable and alternative. But many in the environment movement frown on reliance on this source. It can disturb salmon runs, endangering not only the salmon but also the orcas and bears that feed on them. It also uses massive quantities of cement which emits greenhouse gases in its production. Continue reading “How Renewable Energy Can Save Us from Climate Change” →