Things that make you go Hmmmm......

A UK retailer installed moving metal plates in their parking lot that generates energy when cars drive over them, which is then converted to electricity to run their cash registers.

This is a part of their sustainability effort which includes collecting rainwater to flu

sh toilets, solar thermal for hot water and sending food waste to a biomass plant instead of the landfill.

The idea is novel, but I question the benefit of the amount of

 resources needed to install and maintain this power-generating parking lot versus the amount of resources an electric company uses to produce the same 30 kWh per hour.

Hmmmm......