Unfortunately, there are no set standards regulating what constitutes “green.” A host can burn Christmas trees to power its servers and call itself “green.” If the company is reputable it will explain why it is green.
Most buy carbon credits to offset their emissions, but some actually use renewable energy such as wind or solar power. The latter is the most eco-friendly option, but usually yields a price premium because of the added costs involved for the company. Regardless of what option you choose, green hosts are an excellent way to give back to the environment.
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