No Energy Alternative is 100 Percent Green
While green energy alternatives like geothermal and wind are on the rise, there is no such thing as 100 percent green energy without some other issues.
Geothermal energy is one of the greenest technologies, but it can contribute to groundwater pollution if the water escapes. The gases emitted to maintain workable temperatures in a geothermal operation also contain methane, carbon dioxide, and ammonia but in much smaller amounts than other methods.
Wind and solar methods generate no emissions but may require large amounts of land to create enough energy to make the operation worthwhile. This prevents the land from being used for other development or farming, thus limiting the potential multi-purpose land.
Hydroelectric power has no emissions but can impact the fragile river ecosystem. By slowing the flow of water through a dam, temperatures can rise, oxygen can decrease, and sediment can build up. These small changes can greatly affect animal life, fish populations, and plant species that depend on the river.
Nuclear power has little emissions but does create some solid waste. The waste created, however, is radioactive and poses a threat to humans and animals alike. Nuclear power also carries with it the threat of catastrophic meltdown that could cause significant problems for the environment for decades after the accident occurs.