On January 20, his first day in office, US president Donald Trump signed an executive order to withdraw the US from the World ...

Hydrogen can be used in chemicals and as a green fuel. Vast underground stores could help make it an economical option.

Pulling out will harm the US, as well as global public health. What will really matter in the long run? That’s the question we tackle each year as we compile this annual list. The 2025 edition will be ...