Although the technology has existed for at least 50 years, in the 2000s was the first time that efficacy and output increased enough in LED lights to be used in applications such as car headlights. What does LED stand for?

Oil is measured in barrels, which is equal to 42 US gallons or 159 liters.

Venezuela leads the world with 300.9 billion barrels of oil reserves – a 17.8 per cent share of global reserves.