renewable是什么意思？

Last week, France announced that the country will pave 621 miles of road with solar panels over the next five years, with the goal of providing cheap, renewable energy to five million people.

Notwithstanding important recent progress in developing renewable fuel sources, low fossil fuel prices could discourage further innovation in, and adoption of, cleaner energy technologies.

For example, the United Arab Emirates has endorsed an ambitious target to draw 24% of its primary energy consumption from renewable sources by 2021.

Even major fossil fuel exporting countries have great potential to develop renewable energies.

But renewable energy will have to displace fossil fuels to a much greater extent in the future to avoid unacceptable climate risks.

What are suggested as renewable and less-polluting energy alternatives?