The sun provides free energy for the taking. To what extent is this being used?
Solar power comes typically in the form of photovoltaic or concentrated solar. It's big business - that can help save our climate. Browse DW content on solar energy below.
In 60 years of space exploration, we've placed almost 7,000 satellites in orbit. Less than a third still function. The rest is dangerous junk - and their number is growing. Here's how we might mitigate the threat.
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.