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What is the greenest energy source?

All renewable energy sources are strong contenders for the title of ‘greenest energy source’ since they harness carbon-neutral sources of energy such as the Sun or wind and don’t cause air pollution, putting them
leagues ahead of coal or gas power.

Picking a clear winner is, however, tricky. Once you consider the emissions associated with their manufacture and
installation, hydropower has the lowest carbon footprint, according to one major study.

But there are also many other environmental impacts to bear in mind. For example, building hydropower dams
can cause disruption to river ecosystems, while manufacturing solar panels typically involves toxic chemicals.