Future ozone concentrations are mainly driven by the changes in stratospheric halogen loading, with ozone recovery occurring after the peak of halogen loading.

It's called the Pole Adit. And it does have tungsten, a little bit of tungsten, left over, that's the kind of mine it was.

The response to a bad idea like, say, a tungsten light bulb is a better idea. OK?

Alloyed steels, which are sometimes also called special steels and may be considered specialty products, contain small portions of alloying elements such as chromium, cobalt, manganese, molybdenum, nickel, niobium, silicon, tungsten or vanadium.

When the equipment's halogen lamps, worth 12 per unit, had been used up, a professor tried to obtain new lamps from the company in Spain, but this was refused once it was discovered that she was of Cuban nationality.

That message still resonates today, though it was spectacularly wrong. For example, the authors of The Limits to Growth predicted that before 2013, the world would have run out of aluminum, copper, gold, lead, mercury, molybdenum, natural gas, oil, silver, tin, tungsten, and zinc.

The American economist Julian Simon allegedly issued a challenge in 1980 to a group of environmentalists, saying that if scarcity were to be measured in terms of higher prices, they should invest in stocks of any raw metal. The environmentalists put their money on chromium, copper, nickel, tin, and tungsten, and picked a time frame of 10 years.