What happened to alternative energy investments from the 1970s?

The price of oil has gone up significantly since late February, when the US invaded Iran. And when oil prices see a crazy rise, it makes other sources of energy look more attractive. But we’ve been here before - back in the 1970s, oil prices skyrocketed, and people started to turn to alternative or renewable energy sources. But, for a few reasons, it didn’t stick. Marketplace’s Stephanie Hughes explores why.