Tropical Storm Bertha is moving along the Gulf Coast. See the latest path, cone, watches, warnings and Northeast impact forecast.

A tropical storm swirling in the US Gulf is expected to bring heavy rainfall and a "life-threatening storm surge" to the south-east of the country, according to the National Hurricane Center (NHC).

From building wind turbines to reinforcing power grids for rising demand from electric cars, transitioning from fossil fuels to greener economies will require a massive increase in metal extraction.