The Arab oil embargo of 1973-'74 changed the way Americans thought about driving, at least for a little while. Now 40 years later, it's changing again.
In Qatar, a team of visionaries has set out to prove that even in the world's most inhospitable places, sunlight, salt water and CO2 can be transformed into energy, fresh water and food.
It's an almost climate-proof method of raising fish and vegetables cheaply using very little space, water and chemical inputs. Now one man is determined to make it work in Africa.
Demand for animal protein is surging, and so are the environmental costs of producing it. So researchers in the Netherlands are exploring alternatives to livestock, from insects to faux cuts of beef to lab-grown meat.