The easiest, I will assume, means the least expensive and that which requires the least infrastructure and maintenance. Passive solar must be the most powerful and easiest. This means using the sun to warm our homes, heat our water, etc… Walking and bicycling are excellent forms of renewable energy, since we simply need to eat to have energy to use. Gravity is also a good force used for energy, that is why it is used to run simple turbines near moving water (hydropower). Finally, “conservation” is supreme as it avoids the expense of new green toys or gadgets and makes a sizable difference.
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