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The uneven availability of COVID-19 vaccines has become an increasingly urgent and vexatious issue. But managing the problem is proving a hard nut to crack.

When U.S. companies build military weapons systems, electric vehicle batteries, satellites and wind turbines, they rely heavily on a few dozen "critical minerals" - many of which are mined and refined almost entirely by other countries.

The US treasury secretary, Janet Yellen, is calling for governments around the world to support the US in setting up a global minimum corporation tax rate.

The COVID-19 pandemic should have made it abundantly clear how easily a disruption in the supply chain or a sudden increase in demand for a product can lead to empty grocery store shelves and other problems that might directly affect you.

Giant kelp, the world's largest species of marine algae, is an attractive source for making biofuels.

If you have not received your COVID-19 vaccination yet, chances are that your number is coming up soon. What can you expect when you get your shot?

In the "vaccine spat" between the EU and the UK, the common perception is that the UK is winning.

One of the world's largest container ships, named Ever Given, has been wedged across the Suez Canal since it was blown off course by high winds in the early hours of March 23, blocking one of the busiest maritime trade corridors in the world.

Ending the pandemic depends on achieving herd immunity, estimated at 70% or even 80% to 90% of a population. With some 30% of Americans telling pollsters they have no interest in getting vaccinated, that's cutting it a bit close.

Growing food in a sustainable, environmentally friendly way - while also producing enough of it - is among the most important challenges facing the U.S. and the world today.