As part of the climate and weather, wind is always blowing somewhere. It can be harnessed for energy.
The force of the wind can be transformed into electricity, providing a reliable source of renewable energy - when the sun isn't shining. But development of wind power faces many challenges, least among them the size of required infrastructure.
The world is in the middle of a renewable energy revolution. Prices for clean energy systems are plummeting and investments in renewables are reaching record highs. But there's still a major hurdle to the large-scale adoption of green power around the world. The batteries needed to store the intermittent energy from renewables – such as solar and wind – are still too costly.
The EU encourages member states to opt for renewable energy to combat climate change. But Poland's strongly coal-based economy seems to be moving in the other direction. Scores of wind turbines have been built on the country's windy Baltic Sea coastline over the last two decades. But now Poland is introducing tough restrictions on the construction of new wind farms.