Energyfish are small hydropower plants that are quick and easy to install in rivers, while continuously supplying clean energy.

Can you have hydro storage without water? A British start-up is looking to open up the potential of pumped hydro renewable energy storage.

Hydrogen has long been speculated as a potential fuel of future aviation. Are we close to achieving this goal?

There are many potential ways to store surplus renewable energy, but hydrogen is emerging as one of the most promising. New advances are making it cleaner and more practical.

Hydropower is one of humanity's oldest forms of energy, but there are still vast areas of the sector left unexplored.

A new approach to storing renewable energy looks to recreate the process of hydroelectric dams under the ocean.

Feeding an increasing population with a growing appetite for meat is a major challenge for our future. One biotech firm hopes a new animal feed can make the process greener.

Hydrogen vehicles come with major pros and cons. One of their biggest downsides is that they require expensive fuel tanks. A new material looks to change that.

Cotton is the world's "dirtiest crop" - with a huge environmental and social impact on our planet. Now one startup in London is looking at how tech could help make production more sustainable and transparent.